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Ethan CrensonHello all, Here is an Orbilia found by a friend
Asci with 4 spores
Jennifer Fiorentino,
01-12-2020 15:59
Franz Berger,
01-12-2020 17:16

Re : Asci with 4 spores
To possibilities:
First: 4 of 8 ascospores are vanishing in course of maturisation, in this case, You could find normally also asci with 6 or 8 spores.
SEcond: nature has provided only 4 spores, which is the case in Pyrnidium actinellum and is not bound to the number of septa ! You will find this also in spores with 2 septa also, but normality are 8/ ascus..
In lichens there are also examples with 1, 2, 4, 8, 16, 32, 64, .../ ascus; e.g. Pertsuaria has some species with only 1 spore, which has no septum..
First: 4 of 8 ascospores are vanishing in course of maturisation, in this case, You could find normally also asci with 6 or 8 spores.
SEcond: nature has provided only 4 spores, which is the case in Pyrnidium actinellum and is not bound to the number of septa ! You will find this also in spores with 2 septa also, but normality are 8/ ascus..
In lichens there are also examples with 1, 2, 4, 8, 16, 32, 64, .../ ascus; e.g. Pertsuaria has some species with only 1 spore, which has no septum..
Jennifer Fiorentino,
01-12-2020 20:03
Re : Asci with 4 spores
Many thanks for your input. I did identiify my lichenicolous fungus as P. actinellum based on the final 4 spores in the ascus as well as on presence of 3-septate spores and their size.. So if I understood your first statement correctly the development does not stop at the 4 spore stage but may go on and eventually "extra" spores do not mature further so ascus remains with its 4.
I agree with your second statement where you say that there is no connection between spore number and number of septa in each spore.
Thanks.
I agree with your second statement where you say that there is no connection between spore number and number of septa in each spore.
Thanks.