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31-05-2025 00:51

Ethan Crenson

Hello, Last week in New York City this Orbilia wa

30-05-2025 14:40

Josep Torres Josep Torres

Hello.An ascomycete from last May 10th, sprouting

30-05-2025 17:55

Louis DENY

Hello forum!Touvé près de Belfort, altitude 350m

30-05-2025 12:53

Gernot Friebes

Hi,I'm struggling to find a name for this species.

17-05-2025 18:52

Francois Guay Francois Guay

I found this interesting asco in Quebec,Canada las

28-05-2025 21:19

Terje Kristiansen

The rose is intertwined with black elderberry.Prob

26-05-2025 19:11

Edmond POINTE Edmond POINTE

Bonjour, apothécie poilue, jaune pale 495µm poil

28-05-2025 15:19

Thomas Flammer

Substrate: pretty much soaked Fagus wood under new

21-05-2025 08:31

Josep Torres Josep Torres

Reddish-brown, grain-like ascomata, measuring 0.7â

28-05-2025 07:56

Per Marstad Per Marstad

We are a group of 8 entusiastic "Hunters" who have

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Lachnum(?) on fern
Stefan Jakobsson, 31-05-2022 02:53
I found a hairy discomycete on an old petiole of Athyrium filix-femina on the verge of a forest stream in Southern Finland.

The apos are centrally attached, subsessile, up to half a mm diameter excluding hairs, light beige.


The marginal hairs are 102-137 × 5.8-7.1 µm, tapering to a point, without crystals, only slighly refractive content, 5-7 times septate, faintly granulose but perhaps not all the way to the very apex. In addition also some shorter hairs less acute, granulose to the apex.


The asci are 34-44 × 3.8-5.5 µm, eight-spored, without croziers, spores biseriate, apex slightly blue with IKI.


The paraphyses are 53-63 × 4.3-5.4 µm, lanceolate, with low-refractive content, protruding 15-25 µm beyond the ascus tips.


The spores are 6.8-9.1 × 1.5-1.8 µm, Q = 3.9-5.4, oil 0.


A few hairs (perhaps 1-2 percent) develop one or a few red brown internal droplets within a few minutes after addition on Lugol.


I have not found many species of neither Dasyscyphella nor Lachnum on ferns in the litterature and not either anything else matching. Perhaps somebody has an idea?


If someone has access to the following paper I would be greatful for a copy:


Bøhler HC (1974) Taxonomical studies on some Norwegian Helotiales (Ascomycetes) on fern remains. Norw J Bot 21:79–100.


Stefan

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Hans-Otto Baral, 31-05-2022 07:38
Hans-Otto Baral
Re : Lachnum(?) on fern
Great find and docu! This must be Lachnaster miniatus (now Psilachnum miniatum).

The protologue also includes rough hairs, unlike the other collections in my folder which is in Psilachnum in Pezizellaceae. What is considered synonymous, Lachnum wasingtonense, has apparently smooth hairs, though not explicitely stated.

This would be worth to be sequenced as I am not at all sure that a Psilachnum may possess warted hairs.
Stefan Jakobsson, 31-05-2022 18:52
Re : Lachnum(?) on fern
Thank you! As a matter of fact I had checked out the Psilachnums. This one was, however, so much bigger than other Psilachnums I have seen, so I rejected the idea. Also, I didn't see a Psilachnum bubble in the asci. The miniatus description gives a size of 0,1 mm while this one was mostly 0,5 mm.

I'll see what I can do with the sequncing.


Stefan

Hans-Otto Baral, 31-05-2022 20:18
Hans-Otto Baral
Re : Lachnum(?) on fern
It is correct that this species appears to be unable to form the ascus bubble. It has unusual characters, so maybe it is not a real Psilachnum, but what then?