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Diphasiastrum sitchense (Rupr.) Holub  
Family: Lycopodiaceae
[Diphasium sitchense (Rupr.) A. & D. Löve, moreLycopodium complanatum var. sitchense (Rupr.) Farw., Lycopodium sabinifolium subsp. sitchense (Rupr.) Calder & Taylor, Lycopodium sabinifolium var. sitchense (Rupr.) Fern., Lycopodium sitchense Rupr.]
Diphasiastrum sitchense image
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Warren H. Wagner Jr. & Joseph M. Beitel in Flora of North America (vol. 2)
Horizontal stems on substrate surface or shallowly buried, 1--2.7 mm wide; leaves appressed, broadly lanceolate, 1.8--3.2 X 0.5--1 mm, apex blunt. Upright shoots clustered and branching mostly at base, 5.5--17.5 cm; leaves appressed, broadly lanceolate, 1.8--3.2 X 0.5--1 mm, apex acuminate. Branchlets dark green, somewhat shiny, round in cross section, 1.7--2.5 mm wide, annual bud constrictions inconspicuous. Leaves on branchlets monomorphic, 5-ranked, not overlapping, appressed to spreading-ascending, incurved, free portion of blades 3.4--5.6 X 0.4--0.9 mm, widest at middle, apex sharply pointed. Peduncles absent or rarely 1 cm. Stalks absent. Strobili solitary on upright shoots, 4.5--38 X 3--5 mm, gradually narrowing to rounded tip. Sporophylls deltate, 1.8--3.6 X 1.7--2.8 mm; apex rounded. 2 n = 46. Alpine meadows, open rocky barrens, conifer woods; 200--2000 m; Greenland; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld., N.S., Ont., P.E.I., Que., Sask., Yukon; Alaska, Idaho, Maine, Mont., N.H., N.Y., Oreg., Vt., Wash.; Asia in Kamchatka, Japan. The mature shoots in Diphasiastrum sitchense resemble the juvenile phases of the other species. The unique, round, 5-ranked leaves may represent an early developmental state. The hybrid Diphasiastrum alpinum X sitchense is very rare. It is known from Greenland, British Columbia, Newfoundland, Montana, Oregon, and Washington. Specimens of D . sitchense from Greenland, Newfoundland, and Washington cited by J. H. Wilce (1965) are actually this hybrid.

Diphasiastrum sitchense
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Michelle LaVasseur
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Michelle LaVasseur
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Michelle LaVasseur
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.