seconde photo

spores

marge

Unguiculariopsis ravenelii subsp. hamata = Peziza hamata

Merci beaucoup Guy... Quelle célérité!!!

Pour confirmation va voir à http://www.cybertruffle.org.uk/cyberliber/59575/0032/0053b.jpg
et pages suivantes.

J'ai d'ailleurs été un peu trop rapide et j'ai commis un lapsus et même une combinaison inédite (Peziza hamata)!
Il faut lire Unguiculariopsis ravenelii subsp. hamata = Pithyella hamata

Dear Guy,

Well done to point him to Wen-ying Zhuang's work. A paper about our search for the type specimen of this species is in Korf, R. P., T. Iturriaga, & W.-y. Zhuang. 1988. Lost and found: a discomycete pilgrimage. Mycotaxon 31: 85-88, also available on the Cyberliber website.

Dick

I have today received the same specimen, leg. A. Molière, mis. Jean Mornand, on Buxus with Rhytidhysteron hysterinum. I identified it as U. ilicincola at first glance. When I look in Zhuang's key, I must say that it is somewhat unfortunate to key out species according to their substrate.

U. ilicincola and U. ravenelii ssp. hamata appear not to be very distinct. In Zhuang's paper I find on p. 40 the distinguishing characters: U. ilicincola with smaller apos, longer non-dextrinoid hairs, larger excipular cells, lack of subhymenium, presence of subspherical and larger spores.

This might be all true, but in addition to this I found a striking extracellular hyaline exudate in the hymenium which is present in the three specimens I have seen, and which I did not see in any other speices of the genus (I do not know ssp. ravenelii).

The globose spores are uniguttulate according to Zhuang. This is also the case in two of the three finds (see attach),

while a third has several guttules (always in the living state). I think this feature is variabel within this subspecies. That in Jean-Pierre's photo the spores seem eguttulate is surely due to mounting in Melzer or a similar viscous medium.

Here I tested the specimen of A. Molière for the dextrinoidity of the hairs. U. ssp. hamata is said to have dextrinoid hairs (Zhuang), but I cannot see the least reaction. I mounted directly in MLZ, and later also tested KOH-pretreatment, first at room temperature and later by shortly boiling the slide. Washing with water and treating with MLZ yieded no reaction, see the attached image.

Zotto

Dear Zotto,

I would refer to the the yellow-brown reaction of the hairs in your photo as "dextrinoid"! They certainly don't look hyaline. Maybe we use the term differently.

Dick

Dear Dick

The excipulum is, of course, redbrown (in any mountant), but the hairs look yellowish because of the iodine colour. A dextrinoid reaction of cell walls is some kind of rose-red. I am sure that I would be able to make the very same photo showing yellowish hairs in U. ilicincola with the very same treatment. Possibly the dextrinoid reaction is variable within a species. I saw it very well in some specimens of Hyaloscypha, but I remember I found it not that constant between populations of the same species.

Zotto

La couleur de l'hyménium semble également plus en accord avec ilicincola ("disco concavo pallide brunneo vel purpureo v. roseo-cinereo". Alors que celui de hamata est décrit "disco aurantiaco obscurante".
Mais, ces deux taxons sont-ils vraiment distincts ?
Amitiés, Guy