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Philippe PELLICIERSur branche de mélèze (Larix) près de la neige,
Octospora gemmicola or?
Zuidland Peter,
06-06-2021 08:05
I have what I think is an Octospora growing on moss but I am not sure how to evaluate the spores (see attached) as there are different numbers of guttules, hence wondering which species it might be.
Spores in water: 17.2-23.1 x 7.1-9.9, Q mean =2.29 (2.0-3.04 n=20)
In Eucalyptus regnans cool temperate forest, Sth Gippsland, Victoria. Australia.
Happy to show more micro if needed.
Many thanks
Peter
Octospora-Balk-040621d-water-0002.jpg
Octospora-Balk-040621b-water-0002.jpg
Octospora-Balk-P6030157f-0001.jpg
Hans-Otto Baral,
06-06-2021 09:46
Re : Octospora gemmicola or?
This is Phaeohelotium baileyanum (= Helotium terrestre Berk. & Broome). Known only from Australia under Eucalyptus. But it would be good to look for the croziers because there is a more rare species without.
Not sure if my article is available online. I try to upload:
Baral H.O., Galán R., Platas G., Tena R. 2013. Phaeohelotium undulatum comb. nov. and Phaeoh. succineoguttulatum sp. nov., two segregates of the Discinella terrestris aggregate found under Eucalyptus in Spain: taxonomy, molecular biology, ecology and distribution. Mycosystema 32(3): 386–428.
Baral-et-al.-2013-Phaeohelotium-on-Eucalyptus-0001.pdf
Zuidland Peter,
07-06-2021 00:06
Re : Octospora gemmicola or?
Thank you very much again for such a fast response. I feel a bit silly now because I see that species nearly everywhere I go, I rarely see fungi so obviously on moss and disregarded that one. A couple of asci images attached.
Hans-Otto Baral,
07-06-2021 08:12
Re : Octospora gemmicola or?
Hmm, this is not clear enough. It sounds like simple-septate, but I am not sure. Perhaps you can use a higher magnification and try more ascus bases? Especially young asci just during their formation are suitable for good images.
Zuidland Peter,
08-06-2021 07:51
Re : Octospora gemmicola or?
A bit difficult for me trying to find the younger asci but maybe these images are ok, all in water.
Some spores from today also, if that helps.
Peter
Some spores from today also, if that helps.
Peter
Disc-yellow-on-moss-P6030161f-0001.jpg
Hans-Otto Baral,
08-06-2021 17:18
Re : Octospora gemmicola or?
Yes, it now looks clearly like without croziers. I must correct myself. P. undulatum isn't rare, but there is only one sequence from Spain under Eucalyptus globulus. Another new sequence is from New Zealand under Kunzea with 2 % distance. So there is a wide field of research still, since there seem to exist half a dozen of very similar species.