Guide to Liverworts of Oregon: Key to Genera 79
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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 > 77b pores not stellate > 79
Marchantia alpestris, Benton Co., Oregon. DHW m1641
79a Epidermal pores compound, the pore formed by a barrel-shaped chamber that projects below
the epidermis into the underlying air space; both male and female receptacles elevated on stalks called carpocephala
(Couplet 80)
Left: Conocephalum conicum, Goodman Creek, Lane Co., Oregon. DHW m1778a. Middle: Asterella bolanderi, Wagontire Rock, Monterey Co., California. DHW m1230b; right: :Asterella californica, California, Tulare Co. DHW 2xxx;
79b Epidermal pores simple, composed of concentric rings of cells continuous with the epidermis; only female receptacles elevated, the antheridia in sessile receptacles
(Couplet 81)