Guide to Hornworts of Oregon: Key to Phaeoceros 1
Hornworts 1b stalked ventral tubers absent > Hornworts 2b spores yellow > Phaeoceros 1
Phaeoceros pearsonii - Left: Santiam Highway, Linn Co.,Oregon. DHW m2685. Right: Goodman Creek, Lane Co., Oregon. DHW m1782.
1a Spores yellow-brown to smoky brown, with large, roughened bumps on the distal surface; chloroplasts ovoid to medially constricted as if dividing; older thallus with tuberous thickenings on the margin.
Phaeoceros pearsonii
Phaeoceros hallii - Spore, distal view. Slagle Creek, Jackson Co., Oregon. DHW 9579.
1b Spores yellow, finely echinate distally (except bumpy in P. hallii ); chloroplast shape usually ovoid to angular, not constricted in middle; thallus with tubers lacking or older thallus with tuberous thickenings on margins.
(Couplet 2)