Racomitrium macounii Kindb. in Mac.


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Synonym: Bucklandiella macounii (Kindb. in Mac.) Bednarek-Ochyra & Ochyra
Bucklandiella macounii (Kindb. in Mac.) Bednarek-Ochyra & Ochyra subsp. alpina (E. Lawton)
Racomitrium macounii Kindb. in Mac. subsp. alpinum (E. Lawton) Frisv.

Special status: NONE

Recognition: I recognize this in the field (never with high confidence) by its olive to reddish tinge and short hair points. Identification is confirmed by leaf sections; the leaf margins are bistratose in 2-4 rows (margins sometimes multistratose and even wider) and the nearly terete costa is usually 4 cells thick at base and 3-4 stratose at midleaf. The typical form (subsp. macounii) is the only racomitrium with distinctly crisped leaves when dry.

Distribution: Not common, widespread at higher elevations. In Oregon I have seen it only near the Cascade crest and on the east slope.

Comments: The subsp. alpinum described by Elva Lawton (as Rhacomitrium macounii forma alpina) has longer hairpoints, is more shiny in luster, and has leaves which are not crisped when dry. I have seen both in the Cherry Creek Basin RNA (Winema National Forest) and they look quite different. I'm treating them as synonyms here out of convenience. The difference is marked so the subspecific names should be easy to apply. Further study may show these taxa deserve specific rank.


Racomitrium macounii subsp. macounii; Snow Lakes, Klamath County, Oregon. DHW 8429.



Racomitrium macounii subsp. macounii; Snow Lakes, Klamath County, Oregon. DHW 8429.



Racomitrium macounii; Mt. Baker-Snoqualmie N.F., Washington. R. Lesher 575



Racomitrium macounii; Mt. Baker-Snoqualmie N.F., Washington. R. Lesher 575



Racomitrium macounii; Mt. Baker-Snoqualmie N.F., Washington. R. Lesher 575



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Guide to Racomitrium of Oregon
Created 2007 Northwest Botanical Institute