Hello Everyone,

I would appreciate some help with a delightful minute species of probably Calycellina.Found in abundance on decaying leaves of Alnus glutinosa from a very wet location in North Argyll.Apothecia very small, ranging from 100µm to about 1 mm. brown . Sessile with a marked basal ring of dark cells. Excipular structure of thin-walled rounded cells, almost 'prismatica' Apothecium surrounded be a very variable fringe of delicate hairs, mostly very short, occasionally clearly visible  as ion the photo. Asci with pore that is Iodine +ve, Spores narrowly elliptical about 8 x 3. Paraphyses slender. Hairs, paraphyses and spores mostly without inclusions. Pictures taken from fresh material in water.

Apologies fro the lack of scale bars: at the time the measurement system was not functioning.

Reagrds to all, Peter Wilberforce

Hans-Otto Baral, 19-02-2015 10:33

Re : Unknown Calycellina

Dear Peter

do you also have a photo of the more basal excipulum? The absence of elongate VBs in the paraphyses and hairs excludes a Calycellina. My idea on this substrate is Pyrenopeziza betulina (on Betula leaves) or the similar P. fuckelii (= Microscypha monticola) on Salix leaves.
But I might be wrong ....

Alnus is certain?

Zotto

Hans-Otto Baral, 19-02-2015 14:06

Re : Unknown Calycellina

Thanks for additions. the point is that the excipulum should be of globulosa (or more angularis in dead state) up to the flanks.