Phaeosphaeria subgenus Vagispora

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Phaeosphaeria subgenus Vagispora

Björn Wergen, 22-02-2012 20:43

Hi,

I have found a Phaeosphaeria on dead Poaceae stems with 5septated, 27-30x6-7,5µm spores. I have tried Shoemaker&Babcock and Leuchtmann and come to Phaeosphaeria larseniana, which has smaller spores (Shoemaker: 20-27x7-9µm). I am sure it is a species of subgenus Vagispora. Perhaps someone can help :)

I did not see a sheath. The spores are smooth.

regards,
björn
-------------------

I think it can be P. vagans with no longitudinal septa. P. vagans seems to be a very variable specimen...

Björn Wergen, 23-02-2012 14:56

Re : Phaeosphaeria subgenus Vagispora

Here are some new photos, I am sure it is a dicote substrate, the fb are about 80-150µm broad and have a small ostiolus. Spores are permanently (I have 3 collections now) around 28-32x5,5-7,5µm, quiet too big and too pale for P. luctuosa, which has a similar length. Perhaps this photos will help by identification.

The interesting thing is that the spores have obviously 5 septa in most cases, but inside asci there are many with more septa, I have counted up to 9 septa in some cases). There are no longitudinal septa.

regards,
björn

btw: I am always looking for literature about Phaeosphaeria, Leptosphaeria and allies (Massariosphaeria, Kalmusia, Paraphaeosphaeria etc.).

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