Guide to Liverworts of Oregon: Key to Genera 75
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1a plants thallose > 2b chloroplasts numerous > 62b thallus tissue complex > 70b terrestrial > 72b pores differentiated > 73b gemmae absent > 75
Reboulia hemisphaerica. Epidermis, showing large trigones. Willamette River, Clackamas Co., Oregon. J. Christy 10175.
75a Cells of upper epidermis with large, often bulging, trigones
(Couplet 76)
Asterella bolanderi, Wagontire Rock, Monterey Co., California. DHW m1230b
75b Cells of upper epidermis without large trigones
(Couplet 77)