Hello, dear community.
There is the species with two varieties or (could be) different species. I would say that this is Arrhenia sphagnicola. M. lange (Nordic macromycetes, 1992) synonymized this with A. philonotis (but they are not the same in IF).
My feature is that there were two morpho- and ecological forms of this species growing in raised bog. The first is hummock form, lighter and smaller, with shorter spores, appearing in earlier season. The second is larger (more stout), with darker cap and stem, spores are longer, and fruiting in late summer.
Hummocks and lawns quite differ in conditions: bog water table, humidity, sphagnum species, tree and shrub canopy presence.
Spore range and shape of both forms as described by Lange (1992) for A. philonotis (=sphagnicola).
The second, lawn form has some similarity with A. onisca: dark cap, fruiting in late summer, but spores size not coincide at all.
Could i find someone opinion on this group systematic here?
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