07-06-2025 15:39
Edvin Johannesen
A friend sent me a few Betula seeds with tiny blac
04-06-2025 15:10
Stefan JakobssonHi forum, On a herbaceous stem, possibly Aegopodi
03-06-2025 20:52
Stefan BlaserHello everybody, I didn't get anywhere with this
20-05-2025 22:15
Francois Guay
I found this ascomycete at the base of a dead fern
30-05-2025 17:54
Louis DENYHello forum!Touvé près de Belfort, altitude 350m
31-05-2025 00:51
Ethan CrensonHello, Last week in New York City this Orbilia wa
Hello!I found an interesting dothideomycete in an old stream bed near water. It resembles description of T.lineolatispora with the striate suface of the spores but I'm kinda short on literature with these. Substrate is some old wooden stick of unknown origin that appeared to be waterlogged some time in the past. Would someone perhaps have a bit more insight or have another suggestion?
22.3.2025, floodplain lowlands forest, Ižakovci, Slovenia.
Best regards!
this fits well T. wegeliniana Holm described in 1988 by Holm & Holm (studies in Lophiostomataceae). Sorry, I don't have the paper in pdf format.
T. lineolatispora is indeed very similar by its ascospore morphology but was found in a mangrove in Mexico. If proved identical, it would be a later synonym (1992).
Best,
Jacques
Thanks for the reply! I was just reading that paper before the post and it bothered me that I didn't find any info on the spore striation? But otherwise I was thinking the same and agree on the written. Also striation is sometimes barely visible and it might be also overlooked? I later found an older chat here on forum where striation is mentioned. What is on the other hand difference with T.hydrophila?
to my knowledge, the striated ascospore wall is the most reliable characteristic distinguishing T. wegeliniana from T. hydrophila. I agree it may be easily overlooked.
T. hydrophila is an ill-defined taxon, variously interpreted in the past, thus ambiguous.
All phylogenetic results trend to show Trematosphaeria is paraphyletic, when not polyphyletic. It was an attractive name accommodating fairly different species and unfortunately these two aquatic taxa were not studied phylogenetically. Welcome to the world of freshwater ascomycetes!
Jacques
Yes, it seems like there is still much clarification that needs to be done with many of these small ones, same as with larger ones on the other hand. But as a former hobby fisherman it's always a pleasure to find ones associated with water.
Best regards!