Guide to Liverworts of Oregon: Cephaloziella phyllacantha (C. Massal. & Carestia) Müller Frib.
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Synonym: None.
Special Status: None.
Recognition: The small size of this liverwort, with its dentate, bilobed leaves, heavily armed on margins and abaxial leaf surfaces makes it stand out under a microscope.
Distribution: On rock or damp soil in rock crevices, rarely on wood; low to high elevations. Presently not known from Oregon although some sterile specimens of C. divaricata approach this species in general appearance because of extreme development of abaxial papillae.
Comments: Cephaloziella phyllacantha appears to be much more abundant in western than eastern North America. The western forms are characterized by large, prominent papillae on leaf cells. This species is reported to be associated with C. massalongoi on copper bearing substrates in central Europe but no such association is evident in North America.
Cephaloziella phyllacantha. Stained with toluidine blue. North Cascades, Washington. Lesher 2251A.
Cephaloziella phyllacantha. Stained with toluidine blue. Gynoecial bracts. South Greenland, Schuster 82-1568 (F).
Cephaloziella phyllacantha. Stained with toluidine blue. Perianth. South Greenland, Schuster 82-1568 (F).
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Cephaloziella phyllacantha. Stained with toluidine blue. South Greenland, Schuster 82-1591(F).