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31-05-2022 02:53

Lachnum(?) on fern
Stefan Jakobsson

I found a hairy discomycete on an old petiole of A

31-05-2022 10:43

literature request
Lothar Krieglsteiner Lothar Krieglsteiner

Does somebody have a pdf or other file-type of:Hei

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conidiomata immersed. Conidia on short conidiophor

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Hi,I found this Pyreno on fallen branch of Larix.T

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Bonjour, Je recherche une description détaillée

25-05-2022 10:53

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Amphisphaeriaceae
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Bonsoir, Sur branche morte attenante de Corylus a

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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?