Guide to Hornworts of Oregon: Key to Anthoceros
Hornworts 1b stalked ventral tubers absent > Hornworts 2a spores black > Anthoceros
Anthoceros fusiformis - Spore in proximal view. Santiam Highway, Linn Co., DHW m2688.
1a Spores bumpy-echinate on proximal face, with an unornamented strip along the trilete mark, distal spines narrrow and sharp, nearly always separate in side view. Usually away from urban areas; native.
Anthoceros fusiformis
Anthoceros punctatus - Spores in proximal view. Sutton Creek, Lane Co., Oregon. DHW m1758
1b Spores smoothly foveolate on proximal face; distal spines stout at base, sometimes appearing forked in side view. Usually in urban areas; probably exotic.
Anthoceros punctatus