Racomitrium pacificum Ireland et Spence


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Synonym: Bucklandiella pacifica (Irel. & Spence) Bednarek-Ochyra & Ochyra

Special status: NONE

Recognition: A species which consistently lacks hairpoints, it seems out of place in the segregate genus Bucklandiella (Bednarek-Ochyra and Ochyra, 2007). A combination of strictly muticous leaves and thick walled, deeply yellow-orange pigmented, alar auricles are diagnostic for this species. Lax forms growing in constant spray of water may not develop the deep color of plants in sunnier sites; these also will have the alar cells less strongly thick walled.

Distribution: On rock and also (very rarely) on sandy soil; on serpentine substrates as well as usual acidic geology; fairly frequent in western Oregon at low to middle elevations. Like Racomitrium varium, this species has a broad tolerance of moisture regimes, from stream side rocks to harsh, sunny rock surfaces.

Comments: Its leaf cells lack the strong, flat-topped thickenings centered over the vertical cell walls, thickenings which Bednarek-Ochyra are characteristic of subgenus Cataractae (= genus Codriophorus) and whose absence in this species would include it in subgenus Ellipticodryptodon (= genus Bucklandiella). Small, rounded cuticular ridges over the cross walls (pseudopapillae) are sometimes well developed and prominent in leaf sections. This species was treated as a species of concern in the "Green Guide" (Christy & Wagner 1996) before its widespread occurrence was discovered by inventory work.

Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Upper Kentucky Falls, Douglas Co., Oregon. DHW m1841.



Racomitrium pacificum; Hunter Creek, Curry Co., Oregon. DHW m0021.



Racomitrium pacificum; Cherry Creek RNA, Coos Co., Oregon. DHW 9040.



Racomitrium pacificum; Cherry Creek RNA, Coos Co., Oregon. DHW 9040.



Racomitrium pacificum; Irwin Rocks, Douglas Co., Oregon. DHW 7490.



Irwin Rocks, Douglas Co., Oregon. DHW 7490.



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Guide to Racomitrium of Oregon
Created 2007 Northwest Botanical Institute