iiinova — where your digital self keeps evolving

Reposted by Erik Slootweg

Erik Slootweg @erikslootweg.bsky.social · 07/09/2026

Looked for Ochropsora hippophaes on a few planted sea buckthorns on the way home from work. Found it on the first location. Seems like it is indeed already well established in the Netherlands. Will be interesting to see if it is also present on the wild coastal seabuckthorns. #fungifriends #rust

Underside of seabuckthorn leaves covered in rust sori (uredinia) of Ochropsora hippophaes

1134

Erik Slootweg @erikslootweg.bsky.social · 07/09/2026

1134

Reposted by Erik Slootweg

KWS Group @kwsgroup.bsky.social · 17/06/2026

🌱 A big step for plant breeding in Europe The EU has approved the #NGT Regulation — creating “clear conditions for applying modern breeding approaches”, says our CEO Felix Büchting. A step towards more resource‑efficient, sustainable agriculture 🌎 Our Press release: www.kws.com/corp/en/medi...

0309

Erik Slootweg @erikslootweg.bsky.social · 13/06/2026

Number 4 (and the last I post) is a rust fungus that I haven't seen before, with aecia on Leucanthemum vulgare. The spore size indicates it is Puccinia leucanthemi-vernae, which has Carex caryophyllea as alternative host. Carex montana, host for a similar rust, was also present. #fungifriends

aecia with dark yellow aeciospores and a lighter peridium in a reddish spot on the underside of a leaf of Leucanthemum vulgare

Aeciospores (center) and peridium from Puccinia leucanthemi-vernae.

Microscopic image of aeciospores with diameters indicated in micrometers

1211

Erik Slootweg @erikslootweg.bsky.social · 13/06/2026

Number 3 appears to be the rarest of the fungi I found this weekend; Puccinia globulariae (Kogelbloemroest) on Globularia bisnagarica (Gewone kogelbloem in Dutch). Only a few georeferenced records in GBIF. The leaves had dark spots were the rust's telia were located on the underside. #Fungifriends

Healthy Globularia bisnagarica (globeflower) plant.

Dark brown telia from Puccinia globulariae on the underside of a leaf of Globularia bisnagarica.

Dark spots on the upperside of the leaf where the telia of the rust Puccinia globulariae are located on the underside

Two-celled teliospores of Puccinia globulariae. The out of focus spores have partially germinated and are empty. The sizes in micrometer are indicated

1211

Erik Slootweg @erikslootweg.bsky.social · 13/06/2026

Number 2 in the series plant parasitic fungi I found in the Eifel last weekend; the smut fungus Urocystis colchici (Herfsttijloosbrand) on Colchicum autumnale. Soetenich #fungifriends #smutfungus

Spores of the smut fungus Urocystis colchici bursting from the stem of a Colchicum autumnale plant

spores of the smut fungus Urocystis colchici

0170

Erik Slootweg @erikslootweg.bsky.social · 13/06/2026

A small collection of fungi from last weekend in the Eifel. Number 1; the rust Puccinia angelicae with urediniospores on Angelica sylvestris (Gewone engelwortel in Dutch). Sistiger Heide. #fungifriends #rustfungus

0121

Reposted by Erik Slootweg

Kenneth Loi @kenjmloi.bsky.social · 27/04/2026

Excited to share our discovery of a new programmable RNA-guided DNA-targeting system hiding inside bacteriophages that predates CRISPR. We call it VIPR (Viral Interference Programmable Repeat), and it uses an entirely new logic to find its targets. Thread + link below.

7448197

Reposted by Erik Slootweg

Ruhrpott-Pilze @ruhrpottpilze.bsky.social · 08/04/2026

Entyloma corydali ex Corydalis solida Lohrsdorf, RLP, Germany, 6.4.2026 #Brandpilz #Smutfungus #Phytopathology #FungiFriends

0161

Reposted by Erik Slootweg

Stadsplanten 030 @chrosma.bsky.social · 06/04/2026

Weer een Thlaspi alliaceum, dit keer in een boomspiegel in Zuilen, Utrecht

0132

Reposted by Erik Slootweg

Chris Thorogood @christhorogood.bsky.social · 28/03/2026

We sequenced the genome of 'desert ginseng' (Cistanche deserticola) - a leafless parasitic plant that gave up photosynthesis - and found it lost huge chunks of its own genome…but started stealing genes from its host! Thanks to my collaborators Prof Huang + her talented team👏🏻 lnkd.in/evF5iU9G

6574120

Reposted by Erik Slootweg

Marc Somssich @somssich.bsky.social · 25/03/2026

The fact that Americans thought Auxin was a “Hoax from Europe” rightfully got some attention in my latest #PlantScienceClassics post. But it’s actually even funnier if you learn about the context & consequence of White speaking these words to Went at the AAAS Meeting in Pittsburgh. #PlantScience 🧪 🧵

23827

Reposted by Erik Slootweg

Biodiversity Heritage Library @biodivlibrary.bsky.social · 24/03/2026

The Biodiversity Heritage Library is turning 20! 🎉 We’re starting celebrations with a special anniversary blog series #BHLat20: Treasures from BHL, featuring remarkable works chosen by the people who know them best: blog.biodiversitylibrary.org/2026/03/cele... #ILoveBHL

An historic illustration of two butterflies and a hairy caterpillar. There are green leaves and white flowers in the background.

05418

Erik Slootweg @erikslootweg.bsky.social · 11/03/2026

Phragmidium sanguisorbae (Kleine-pimpernelroest in Dutch) on Poterium sanguisorba (Kleine pimpernel). Multicelled dark teliospores, 60-70 um in length. Found this weekend in the Kennemerduinen near Haarlem (NL). #fungifriends #rustfungi

Poterium sanguisorba; underside of leaf with two types of Phragmidium rust spores

microscopic image of teliospores of Phragmidium sanguisorbae

1102

Reposted by Erik Slootweg

Biodiversity Heritage Library @biodivlibrary.bsky.social · 27/02/2026

🎉 Huge news for BHL: The Field Museum is taking over the hosting of BHL’s website, servers & infrastructure, ensuring long-term stability and access for its 63+ million pages of open biodiversity literature. Learn more: blog.biodiversitylibrary.org/2026/02/tran... #BHLTransition #ILoveBHL 🌍 📚 🧪

An historic black and white illustration of a paper nautilus floating on the ocean. There are boats, a city and hills in the background.

8370150

Erik Slootweg @erikslootweg.bsky.social · 15/02/2026

A bit of sun yesterday and Mibora minima (dwerggras) flowering in the dunes of South Holland. Today it snowed again. No spring yet.

020

Reposted by Erik Slootweg

Pascal Frey @pascal-frey.bsky.social · 13/05/2025

Yet another case of Uromyces plumbarius on Oenothera lindheimeri (Gaura) in the Paris region. #Rust #RustFungus #UrbanPlantHealth #PlantHealthDay @wheatpath.bsky.social @erikslootweg.bsky.social www.biorxiv.org/content/10.1...

094

Reposted by Erik Slootweg

Sipke Gonggrijp @freetimebotanist.bsky.social · 29/04/2025

Net verschenen in natuurtijdschriften. Ons 15-jarig onderzoek naar woladventieven langs de Grensmaas. natuurtijdschriften.nl/pub/1030013/...

4225

Erik Slootweg @erikslootweg.bsky.social · 20/04/2025

The rust Puccinia thlaspeos on Noccaea caerulescens. The rust infection changes the morphology of the plant; instead of flowering stems its stems are full of yellowish leaves covered with telea on the underside. Here on soil heavily contaminated with heavy metals in Kelmis, Belgium.

microscopic image of teleospores of Puccinia thlaspeos

underside of leaf of Noccaea caerulescens with telia

Noccaea caerulescens with one healthy flowering stem and five stems deformed by the rust Puccinia thlaspeos

2261

Reposted by Erik Slootweg

Frédéric Suffert @wheatpath.bsky.social · 08/04/2025

Happy to share this preprint confirming "Uromyces plumbarius first reported on Oenothera lindheimeri in Europe with widespread distribution and association with the rust hyperparasite Sphaerellopsis sp." Thanks @pascal-frey.bsky.social & @erikslootweg.bsky.social! doi.org/10.1101/2025...

095

Erik Slootweg @erikslootweg.bsky.social · 25/12/2024

found two Claviceps-parasitising fungi on the same plant in September this year. Fusarium heterosporum which colors the whole Claviceps sclerotium orange was the second. It has nice banana-shaped 3-septate conidia. #fungifriends

Sclerotium of Claviceps sp. on Glyceria maxima flower covered with orange Fusarium heterosporum

macroconidia of Fusarium heterosporum showing the sizes of the spores (ca 4 x 30 micrometer).

banana-shaped macro-conidia of Fusarium heterosporum

1283

Erik Slootweg @erikslootweg.bsky.social · 25/12/2024

Epicoccum andropogonis, a fungus parasitising Claviceps, a fungal parasite of grasses. Here on Glyceria maxima (Liesgras). One of two Claviceps parasites I found this day in September this year on the same plant. I really like the brainlike structure (and its old name Cerebella). #Fungifriends

spores of the Claviceps parasitising fungus Epicoccum andropogonis

brain-like fruiting structure of Epicoccum andropogonis

1131

Erik Slootweg @erikslootweg.bsky.social · 25/12/2024

Ragnhildiana ferruginea ( www.mycobank.org/page/Name%20... ) on Artemisia vulgaris (Bijvoet). Common, but underrecorded in the Netherlands. Forms brown fuzzy spots on the underside of the leaves. Conidiospores light brown and mostly 1-3 septate.

161

Reposted by Erik Slootweg

Grada Menting @zinkviool.bsky.social · 22/12/2024

Ter afsluiting: Kortsteelgalmug in 25 kmhokken. Van zeer zeldzaam naar zeldzaam.

152

Erik Slootweg @erikslootweg.bsky.social · 03/12/2024

A nice splash of color of the ascomycete Aleuria aurantia (grote oranje bekerzwam in Dutch) on a cloudy day last week. #fungi

microscopic image of the ascospores and bright orange parafyses of Aleuria.

1261

Erik Slootweg @erikslootweg.bsky.social · 23/11/2024

Now is the time to look for Melampsoridium carpini (Haagbeukroest) on Carpinus betulus (Haagbeuk); the bright orange spores stand out on the fallen leaves. Until recently not known in the Netherlands, but in the last 2 years seen at 4-5 locations. These were found in Doorwerth, close to Arnhem.

0172

Erik Slootweg @erikslootweg.bsky.social · 04/08/2024

Tilletia menieri on Phalaris arundinaceae (rietgras). Surprisingly smelly smut fungus with good looking spores. Near Tiel, the Netherlands. #wildplantdisease

010

Erik Slootweg @erikslootweg.bsky.social · 29/06/2024

Hyalopsora polypodii (blaasvarenroest in Dutch) on the fern Cystopteris fragilis. Found it in a botanical garden. This fern is quite rare here in the Netherlands, and this is the first time I saw this nice orange rust.

020

Erik Slootweg @erikslootweg.bsky.social · 04/06/2024

Telia of Puccinia chrysosplenii (goudveilroest) on Chrysosplenium oppositifolium (paarbladig goudveil), near Nijmegen. Have been looking for this species for some time. Glad that @NielsEimers discovered it a few weeks ago. #rustfungi #wildplantdisease

010

Erik Slootweg @erikslootweg.bsky.social · 06/05/2024

Mycocentrospora acerina on Impatiens glandulifera. Found in a wet and shady riparian forest along the Oude Maas, south of Rotterdam. #wildplantdisease

010

Erik Slootweg @erikslootweg.bsky.social · 12/04/2024

Nog een vindplek van Thlaspi alliaceum erbij. Dit keer in een slootkant in Kesteren naast een bomenkweker met ook weer een rijtje beuken. (lookkrodde zou een aardige Nederlandse naam zijn). 4e hok in de Betuwe, 7e in NL.

020

Erik Slootweg @erikslootweg.bsky.social · 23/09/2023

The impressive aecia of Puccinia minutissima on swamp loosestrife (Decodon verticillatus) near Waterloo in Michigan. The story of how the life stages of this rust on swamp loosestrife and sedges were linked is described here: ...

120

Erik Slootweg @erikslootweg.bsky.social · 16/09/2023

Teliospores of Allodus podophylli, Mayapple rust. Nice find during a recent visit to Michigan.

000

Erik Slootweg @erikslootweg.bsky.social · 16/09/2023

Endoconospora cerastii (I think) on Cerastium vulgare near Ede (NL). Thought for a moment that I found Phacellium alborosellum, but this looks very different under the microscope. #wildplantdisease

010

Erik Slootweg @erikslootweg.bsky.social · 30/06/2023

The smut fungus Farysia thuemenii (Zegge-urntjesbrand) in the fruits of the sedge Carex riparia (oeverzegge), a few weeks ago near Arnhem. The spores are 6-7 um in diameter.

000

Erik Slootweg @erikslootweg.bsky.social · 21/06/2023

The smut fungus Urocystis trientalis on Trientalis europaea. Near the Dörenther Klippen in Germany.

170

Erik Slootweg @erikslootweg.bsky.social · 03/11/2022

A beautiful slime mold from last weekend; Arcyria denudata (Karmijnrood netwatje in het Nederlands). Fruiting bodies on a rotting tree trunk with spores in an intricate net-like structure. #myxomycete

010

Erik Slootweg @erikslootweg.bsky.social · 03/10/2022

Telia (dark) and uredinia (lighter brown) of Puccinia sorghi on maize in the local allotment gardens today. Microscopic image of the two-celled teliospores. #rustfungus

000

Erik Slootweg @erikslootweg.bsky.social · 25/09/2022

Another smut fungus; Rhamphospora nymphaeae in the leaves of a waterlily in a garden pond. Neat colorless spores that look like little eggs. #smutfungus #wildplantdisease

000

Erik Slootweg @erikslootweg.bsky.social · 18/09/2022

Another smut fungus I found yesterday; Ustilago trichophora forming large galls filled with masses of small (8-10 um) brown spores on the stems of the grass Echinochloa crus-galli.

000

Erik Slootweg @erikslootweg.bsky.social · 18/09/2022

The smut fungus Microbotryum cordae on Persicaria hydropiper (waterpeper, water-pepper). Small hydrophobic spores with a beautiful net-like structure fill what used to be the flower.

100

Erik Slootweg @erikslootweg.bsky.social · 27/04/2022

The rust Puccinia cribrata on Vinca minor. The infected parts of the plant grow taller, which helps the rust fungus spread its spores. Found it near our allotment garden in Wageningen. Might be new for the Netherlands. #rustfungus

100

Erik Slootweg @erikslootweg.bsky.social · 31/10/2021

Miricatena prunicola on Prunus serotina was in 2011 described in the UK: Kew Bulletin 66:637-642. I am surprised how widespread this fungus is in the Netherlands. I never noticed it before and this year I see it everywhere. Its host was introduced here more than a century ago.

110

Erik Slootweg @erikslootweg.bsky.social · 18/10/2021

Teliosporen van Gladde roosroest (Phragmidium rosae-pimpinellifoliae), nu te vinden op Duinroos (Rosa spinosissima). Erg onopvallende plukjes sporen aan de onderzijde van het blad. Eerder in het jaar vallen de fel oranje aecia meer op. Nationaal Park Zuid-Kennemerland.

000

Erik Slootweg @erikslootweg.bsky.social · 13/10/2021

Telia van Aspergeroest (Puccinia asparagi) op Asperge (Asparagus officinalis). Net over de grens in Duitsland tussen de rivierduinen van de Wisseler Dünen. In Nederland wordt deze roest zelden gezien. #wildplantdisease

000