94 CRYPTOGAMIA. 



Tribe 25. LEUCODONTEiE. 



1. PTEROGONIUM, Swartz. 

 1. Pterogonium gracile, Swartz. 



Pterogonium gracile, Swartz. Disp. Syst. Muse. Frond. Suec. p. 26; Bryol. Europ. 5 

 Pterog. Monogr. p. 4, t. 1. 



Hab. California. 



2. A LSI A, Sulliv. 



Calyptra cuculliformis glabra. Operculum conico-rostratum. Peristo- 

 raium duplex ; exterius denies sedecem lineali-lanceolati ; interim cilia 

 totidem dentibus alternantia filiformia e membrana angusta carinata, 

 orta; ciliolis subnullis. Capsula cylindrical recta vel subincurva, 

 exannulata, brevi-pedicellata, perichmtio elongato emersa. Florescentia 

 dioica ; flores rnasc. numerosi. Caulis arete repens, defoliatus ; rami 

 plus minus resupinati ramulis microphyllis parce breviter subpinnati. 

 Folia ovato-oblongove-lanceolata, losvia, punctiformi-areolata. Habi- 

 tatio arbor ea. Habitus pericli03tium foliorumque areolatio Lasice; 

 peristomiu?n calyptraque Leshew* 



Alda, Sulliv. in Proceed. Amer. Acad. Art. Sci. (Jan. 1855.) 



1. Alsia California, Hook. & Am. (Tab. 25.) 



JSfeckera Califomica, Hook. & Arn. Bot. Beech. Yoy. p. 162 ; Mull. Synop. Muse. 

 Frond. 2, p. 117. 



Hab. California; on trees. 



Grows in elastic masses, of a dark-green color. The primary stem 

 leafless, adhering by fascicles of short rootlets to the bark of trees, 

 giving off at right angles numerous secondary stems 2-3 inches long, 



