Weissia Moss

Weissia inoperculata is known only from the type specimen (Stanford University, Santa Clara County). It has a gametophyte much like that of Trichostomum brachydontium and may prove better placed in Trichostomum. The operculum is weakly marked off by a ring of several rows of small cells.

Leaves elliptic, base weakly or not differentiated in shape, shoulders absent, distal laminal margins plane to erect, rarely incurved, apex plane, acute to rounded-acute, mucro usually strong, of (3-)4-6(-7) cells; costal adaxial stereid band smaller than the abaxial; distal laminal cells 8-10(-13) µm wide. Sexual condition dioicous (perigoniate plants mixed with the archegoniate). Seta elongate, 0.2-0.3 cm. Capsule cleistocarpic, short-elliptic, operculum weakly differentiated, peristome absent.

Hymenostomum inoperculatum H. A. Crum, Madroño 14: 74, figs. 1-6. 1957