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Stamnaria persoonii (Moug. Ex Pers.: Fr.) Fuckel

Stamnaria persoonii (Moug. Ex Pers.: Fr.) Fuckel

Characterisation of species, lacking some information like microscopic features, which are provided in the following diagnostic description, please ask in case of questions.

Stamnaria persoonii is a fungus of Ascomycetes, regarded to belong to Helotiales or Leotiales. Its bright yellow-orange to orange (hydrated), or darker (somewhat brownish) orange (exsiccated), generative fruitbodies are urceolate, meaning shaped like a jar. This habit is result of the discus-shaped so called apothecium, being crowned by a distinct, comparatively long and sometimes constricted above collarette, built of hyaline part of outer excipulum (outer parts), and is much characteristic for S. persoonii, the type of the genus.

The size may reach 0.9 - 1.2 mm across fruitbodies, in height inclusive collar to 0.8 or rarely 0.9 mm without stipe, the collar grows to height of 0.2 - 0.32 mm. For usual there is a distinct slender stipe, quite variable in length, in rare cases up to about 2 mm (depending on situation of fruitbody).

Features of asci (sporangia) and spores within are most important for separation of similar, regularly mixed up species (ineditioned!), still are left besides at time and are added in the following diagnostic description.

True S. persoonii was proved by me to grow primarily on last years decaying remainings of Equisetum fluviatile, Water Horsetail, and will mature from June to August. I saw myself only 3 samples of E. arvense bearing this species, in most cases this host will prove to feed the much more common S. "mougeotii" Gruber ined.! (2006: 54), being regularly mixed up with. There are some reports of S. persoonii growing on other horsetails, still i could not prove this true till now, E. palustre was free of this fungus in sites it was on E. fluviatile. In addition, hosts of S. spp. proved to have been rather regularly misidentified!

The ascocarps (fb.) do apper singular, somewhat closer together on some parts of host, but are not clustered, and won't erupt parts of epiderm as in S. americana, the tips of asci (sporangia) contain an amyloid =J+ structure, being stained blue by jodine. As told above, this sp. is rather rare and nearby in any case growing on E. fluviatile, thus most reports of S. will refer to other spp.

Vegetative, mitotic spores (conidia) producing structures = anamorph, will appear from late summer on living, later dying off horsetails, bearing typical conidia termed Titaeospora equiseti (not separated between S. spp.), which won't be spread by wind, since being glued and connected by secondary anastomoses. The sexual fb. will build at loci of anamorphs in warm season of the next year as i did object.

Distribution as known to me:

Middle to W Europe: Austria; Belgium? - locations of types are missing; Czech Republik - solely anamorph on E. fluviatile; Denmark - solely anamorph on E. fluviatile; France; Germany; Great Britain (Dennis 1956, 1978); Netherlands; Switzerland.
Greenland, Island Disko - on E. arvense.
North America: Canada, Ontario, London - solely Titaeospora equiseti on E. fluviatile.
Stamnaria persoonii is much likelyly native to some parts of North America, but no ascocarps are proved true, solely the asexual stage from Ontario, Canada.
I may assume the species to be distributed in a much greater area than hitherto known.

There was much taxonomic confusion about S. persoonii, resulting in a long list of applied synonyms, caused partially by confusion of different species. S. equiseti was proved by Hoffman's delineation (1790: Veg. crypt. II: 17, tab. 5, fig. 1) to be synonym to S. persoonii, and would be prior to other names, but is less known to mycologists, thus i suggest conservation of the binomen applied here.

Be aware, this is just a short excerpt of my scientific results, which shall be published in some time, thus it makes no sense to tell all results. You may cite given information, but please do contact me before, and don't forget to cite the source, anyone may ask me for futher information.


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© Erwin Gruber

Supplier: Erwin Gruber

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