Observation 200712: Helotiales Nannf. ex Korf & Lizon

Original Herbarium Label: Tapesia strobilicola (Rehm) Sacc.
Growing on old weathered resin flow of Pseudotsuga menziesii tree
Identified using Dennis, R. W. G. (1978). British Ascomycetes. &
Breıtenbach, J., & Kränzlın, F. (1983). Fungi of Switzerland. Volume 1. Ascomycetes.

If you have another suggestion, please, make it as a comment and don’t change our original MO Observation name that links this particular MO observation with the supporting herbarium collection deposited (or to be deposited) in the UBC Herbarium, Vancouver, BC. We have our MO Observations cross-referenced with the supporting herbarium specimens and we do not want to lose that link. Thanks!
Our last image of this observation is a drawing that details all the important characters. Consult it before you suggest any changes.

Species Lists


Tapesia strobilicola.jpg

Proposed Names

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Mollisia strobilicola in Fungi of Switzerland
By: Andreas Gminder (mollisia)
2015-03-21 09:47:38 PDT (-0700)

I examined this collection, but found very few spores only. The 8 spores I measured are in the range of 8-10 × 2,5-2,8 µm, one was 3 µm large. But you have to bear in mind, that these are measurements from dead material, and that in Helotiales spores and asci shrink up to 30-35%! It is also indeed like that, that M. lividofusca (and I still think M. strobilicola is nothing separate) has a big spore range and also small spores like 6 or 7 µm occure. But only in a certain percentage, and the major part of the spores will lay in a rang of 9-11 µm, with still some exceptions one or two µm longer or shorter. But M. lividofusca as well as the few descriptions of M. strobilicola are always depicting and/or describing spores WITHOUT oil drops – a very important character in Helotioales. So I strongly doubt that your specimen is M. strobilicola/lividofusca.
Moreover, when I look at the drawing of the excipular structure, it might even be that this is no Mollisia at all, may be not even a Dermateaceae. I see no hints towards a textura globulos/angularis, but it has the look of a textura prismatica (brick-like cells in chains). This does not occure in Dermateaceae.
Jusging from the macroscopic fotos, I wouldn’t be too astonished if that collections turns out to be no mollisioid fungus. But it also looks like as if the collections is already overgrown by mould. Those web-like threads I know from specimens laying for some days in the collection box or from fresh specimens sent with the mail ….

Be it as it is, I anyway have no solution for re-naming your collection without having microscopred it. I only wanted to explain my doubts on the determination (what is always the easier part, I know ….)

Best Friends
By: Danny Newman (myxomop)
2015-03-21 02:13:24 PDT (-0700)
What about the spore size?
By: Oluna & Adolf Ceska (aceska@telus.net)
2015-03-20 03:19:25 PDT (-0700)

In both sources (Dennis and Swiss Fungi) spores are less than 9 µm long for M. strobilicola and M. lividofusca should have spores 6-13 µm long, our collection has spores 7-8 µm long. Did your measurements of spores agreed with the measurements in the Swiss Fungi, or were there more like in M. lividofusca ?
It is difficult to judge what can be expected on our site, Observatory Hill, since it turned out to have a number of newly described species
It is great that we can discuss those problems on Mushroom Observer, in spite of the interference of MO gurus who would like to tell us that this observation is most probably Helotiales order, as we would not know it before.

Not M. strobilicola
By: Andreas Gminder (mollisia)
2015-03-20 01:45:46 PDT (-0700)

This identification is in several respects wrong:
a) Mollisia strobilicola is a synonym of Mollisia lividofusca. M. lividofusca occurs on all kind of decidous and coniferous substrate, including cones.
b) M. strobilicola has spores which are lager and without oil drops.

I have investigated approx. 20 collections labelled M. strobilicola, including the one shown in Fungi of Switzerland – all have turned out to be M. lividofusca.

Created: 2015-03-20 00:22:53 PDT (-0700)
Last modified: 2015-03-20 12:26:36 PDT (-0700)
Viewed: 151 times, last viewed: 2018-02-24 07:59:04 PST (-0800)
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