Uypnuin.] BRYACE^. 361 



from the first by its monoecious inflorescence, short pointed entire leaves, 

 and much longer entire paraphyllia; from the second by its more obso- 

 letely serrated leaves, and by the presence of paraphyllia; from both by its 

 darker green color, more copiously branched stems, and much more loosely 

 areolated leaves, the longer costa, and the pendulous capsule. — (Austin.) 



93. H. Royse, Aust. Dioecious : steins rigid, slender, with 

 few subconipressed branches : leaves scattered, half-ojien, ovate 

 or ovate-lanceolate, sharply acuminate, somewhat concave, 

 flat and minutely serrate on the borders, costate to above the 

 middle ; cells oval and oblong, rhomboidal ; perichatial leaves 

 long-sulnilate, acuminate from an oblong-ovate base, ecostate, 

 subserrate at the apex, squarrose. — Coult. Bot. Gaz. iii. 31. 

 Hab. California (Mrs. Jessie Hoy). 



92. H. Brandegei, Aust. 1. c. Densely cespitose, yellowish 

 green ; stems erect, nearly simple, slightly tumid and com- 

 pressed : leaves imbricate, broadly ovate, concave, 2-3-plicate, 

 abruptly short-subulate or filiform, acuminate, flat on the bor- 

 ders, entire or obscurely serrate ; costa simple or forking, reach- 

 ing the middle ; cells narrowly oblong, fusiform, strict, the basi- 

 lar a little longer, short. 



Hab. Colorado {Brandegee). 



The author compares it with H. murale, H. piliferum, H. Coloradense, 

 and even with //. acuminatum, thus showing the uselessness of descrip- 

 tions made from incomplete specimens. 



Subgenus XIV. THAMNIUM. (PI. 6.) 



Plants dendroid from a subterranean rhizome-like stem ; 

 secondary stems erect, solid, woody, with distichous or fascicu- 

 late apical branches and branchlets. Leaves 8-ranked, those of 

 the primary stems and of the lower part of the secondary very 

 small, distant, scarious, appressed, the upper gradually larger, 

 green, loosely imbricate, ovate-lanceolate, coarsely dentate or 

 serrate at the apex ; areolation dense, narrowly linear, pellucid 

 at the base, gradually shorter-rectangular upward, minutely 

 rhoraboidal-quadrate and chlorophyllose toward the apex. 

 Calyptra covering the capsule to the middle. Capsules gen- 

 erally clustered, ovate-oblong, horizontal by the curving of the 

 short arcuate smooth pedicel. Operculum long-rostrate. Peri- 

 stome large ; segments as long as the teeth, cleft between the 



