Diario de mfeaver

iacomaner added a comment
Yeah, there are tons of good resources out there for whatever stage of familiarity you have. I recommend starting with both the Ohio Moss and Lichen Association webpages as well as the British Bryological Society. Of the former, their Bryology 101 will give you a fairly advanced understanding of terms, morphology, and taxonomy rather quickly. The Common Ohio mosses page is an excellent primer on the most common mosses of the US (not just Ohio). It’s worth checking out their liverwort pages too.

The Learning section of the BBS website is also highly recommendable as a starting place, though not as brief as the former website, it is more polished and comprehensive. Also, their taxon database (they call it “species finder”) is immensely helpful, even if we don’t share 15-30% of their taxa here in North America.

There are some good resources here on iNat, too. Especially for the Pacific NW (though also helpful elsewhere!), @rambryum has a number of very helpful posts on bryologizing tips/tricks as well as taxa guides that are absolutely worth checking out.

Moss, Flora of Alberta (2nd edition), mentions variation of ssp amplexicaule "in our area" (p. 182), but doesn't say anything more about how this variation distinguishes itself. These are all fruiting now, but are there easy to recognize differences?

lallen commented
7h
it depends which reference you look at. Some references split this out as a subspecies, some as a species. VASCAN accepts Maianthemum amplexicaule (Nuttall) W.A. Weber at the species level (not just as a subspecies) (https://data.canadensys.net/vascan/name/Maianthemum%20amplexicaule), but the Flora of North America (FNA) separates it out at the subspecies level. I chose to recognize it because later the records can be more easily split, if it is pulled out as a separate species.

From FNA, M. racemosum racemosum is an eastern taxon, M. racemosum amplexicaule western, with some overlap in central US. Here is the key from the Flora of North America (FNA) (http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101759).

Stems erect; leaves sessile, clasping, blade base rounded; apex of third leaf below inflorescence acute, shorter than 2 mm; w North America. subsp. amplexicaule
Stems arching; leaves petiolate, blade base tapered; apex of third leaf below inflorescence caudate, 12–25 mm; e North America. subsp. racemosum