closer

an ascus

paraphyses

and spores

I have a collection identified as Lophiostoma semiliberum, F-Deux Sèvres, Marais de Poitevin, Phalaris culms, leg. Ch. Lechat & M. Hairaud, soc. Parachnopeziza phalaridis. Perithecia immersed beneath epidermis, with a narrow projecting ostiole (round to flattened in top view). Sp. *29-36 x 5-5.4 µm, 1-septate, slightly inflated and constricted at septum, here with 0.8 µm thick gel sheath in *asci, ends without appendages or with inconsp. acute caps, old 6-septate, 37 x 5.5 µm, light grey-brown.

Apparently I identified myself, so this is not certain.

Zotto

I agree with Zotto.
Moreover spores of Lophiotrema vagabundum ss. str. have a thick mucous sheath while spores of Lophiostoma semiliberum have (sometimes) only small polar mucous caps.

Bernard

Hi Zotto and Bernard,

thank you for your determination! Zotto's collection and mine seem to be very similar. And what I have read now in literature (Saccardo, Migula) fits very well, too. Munk (Danish pyrenomycetes, 429) considers L. semiliberum to be unmature L. arundinis. But the clades in Zhang et al. FD 2009 seem to show that they are very close but not identical (I am not good in reading parsimony trees...).

@ Bernard: thank you also for giving me these distinguishing details. I am now even more unsure that my other find on Hedera is really L. vagabundum.
I have attached a picture of some spores of this find ((26,1)28,2-33(37,8) x 6,1-7,4(7,9) µm).
I can't remember how I came to this determination. I found it together with Unguiculella eurotioides on the same branch and I was more engaged with the latter...

Best regards,

Martin

There is also a record in Ascofrance by Alain, but on Urtica

http://www.ascofrance.fr/index.php?r=bdd&page=fiche&id=2350
Zotto

Yes I saw this docu, but are only these encircled ascocarps the questionable ones, Alain? They look like a Hysterium (joking ;-) ). But I have no experience in the variability of this genus...

Cheers,

Martin