Guide to Liverworts of Oregon: Clevea hyalina (Sommerf.) Lindb.
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1a plants thallose > 2b chloroplasts numerous > 62b thallus tissue complex > 70b terrestrial > 72b pores differentiated > 73b gemmae absent > 75b trigones small or absent > 77a pores stellate > 78a ventral scales conspicuous > Athalamia hyalina
Synonym: Athalamia hyalina (Sommerf.) Hatt.
Special status: None
Recognition: The most distinguishing feature is the position of the carpocephalum in the center of the thallus, not developing from the apex or margin. Long, white scale appendages at the thallus apex are a good clue. Under the microscope the stellate-thickened walls surrounding the pores are diagnostic.
Distribution: On soil of ledges and under rock overhangs; throughout the state at all elevations.
Comments: This is one of the most common thalloid liverworts of upland habitats, not quite as common as Asterella gracilis. This species is treated in the genus Athalamia in most contemporary literature but a recent molecular study of the phylogeny of the Cleveaceae has shown that it should be returned to Clevea (Rubasinghe et al. 2011).
Lookout Point, Lane County, Oregon. DHW m2110.
Scale appendages curling around apical notch of thallus. Hells Canyon, Wallowa County, Oregon. Morris s.n.
Epidermis, showing pores and outlines of air chambers beneath them. Hells Canyon, Wallowa County, Oregon. Morris s.n.
Epidermis, showing pores stained with toluidine blue. Hells Canyon, Wallowa County, Oregon. Morris s.n.
Thick section of thallus showing ostioles and antheridial chambers. Hells Canyon, Wallowa County, Oregon. Morris s.n.
Lookout Point, Lane County, Oregon. DHW m2110.
Proximal. Calif., Monterey Co., Santa Lucia Range, Los Padres National Forest, Arroyo Seco-Escondido Flats Rd. Doyle 613 (UC).
Distal. Calif., Monterey Co., Santa Lucia Range, Los Padres National Forest, Arroyo Seco-Escondido Flats Rd. Doyle 613 (UC).
Side. Calif., Monterey Co., Santa Lucia Range, Los Padres National Forest, Arroyo Seco-Escondido Flats Rd. Doyle 613 (UC). <