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68 GRIMMIA PENNSYLVANICA, Schwægr.

Tab. 43.

robustiores, rigidulae, pulvinatæ et vage cæspitantes; cæspitibus densis facile solubilibus atro-viridibus leviter incanis.

uncialis et ultra, pluries innovando-ramosus.

dense approximata; caulina patentia, elongato-lanceolata, submutica, inferne canaliculata margineque reflexa, superne subcoinplicata; costa subcontinua; reti apicali raiimto quadrato, basilari e cellulis amplioribus oblongis sinuosis: perichætialia majora, in pilum hyalinum brevem scabrum attenuata.

dioici: masculi terminales et demum laterales.

subimmersa, oblongo-ovalis, in pedicello duplo breviore erecta, annulata, sicca lævis; perist. dentibus purpureis lanceolatis acuminatis, superne fissis atque cribrosis, inferne integris crebre articulatis; operculo conico-rostrato erecto; calyptra mitraeformi, basi 4–6-fissa, ad operculi basin descendente.

On rocks, billy districts, New England to Georgia.

TAB. 43.—