Guide to Liverworts of Oregon: Key to Asterella 3
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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 > 79b pores simple > 81b thallus mostly <8 mm wide > 82a receptacle conic > Asterella 1b sex organs on primary thallus > Asterella 2b monoicous; spores <100μm > Asterella 3
Mannia gracilis - Left and middle: high and median focus of spores, Elkhorn Ridge, Baker Co, Oregon. DHW 8191; right: Cone Peak, Linn Co., Oregon.
3a Spores yellow; strongly reticulate with high ridges; carpocephala globular; low to middle elevation forest zones.
Mannia gracilis
Left: Asterella saccata - Idaho. Leiberg. Right: Asterella lindenbergiana Linton Meadows, Lane Co., Oregon. DHW
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3b Spores brown or violet; carpocephala hemispheric or conical; subalpine to alpine.
(COUPLET 4)