392 BRYACE^. [Tlypnum. 



sum (?), Sulliv. & Lesq. Muse. Bor.-Amer. Exsicc. (ed. 2), 

 n. 478. 

 Hab. Decayed trunks; White Mountains [Oakes, James). 



152. H. circinal6, Hook. Stems long, creeping, pinnately 

 branching, flexuous ; branches numerous, short and liorizontal 

 or longer and flexuous : leaves yellowish green, darker colored 

 at base, secund, circinnate, lanceolate, long-subulate, concave 

 below, plane and subserrate at the point, ecostate ; pericha3tial 

 leaves erect, more distinctly serrate : capsule oval, cernuous, 

 subi)endent, reddish brown ; operculum short, conical ; inner 

 ])ei-istome yellow ; cilia one or two, as long as the entire seg- 

 ments. — Muse. Exot. t. 107; Muell. Syn. ii. 318. Stereodon 

 circi/ialis, Brid. 



Haij. On trees, Nortliwest coast [Menzies) ; Vancouver Island {Lycll). 



The autlior reniarlcs tliat tlie species approaclies tlie nearest to If. 

 cupressiforiiie, but tliat it lias the leaves uuich more incurved and the 

 capsule drooping. 



153. H. Sequoieti, Muell. Much resembling slender forms 

 of II. cupressifonne ; prostrate, the branches drooping, pale or 

 dirty green : leaves small, circinnate-falcate, enlarged at base on 

 one side and auricled, narrower and symmetrical on tl^e other, 

 oblong, gradually narrowed into a long falcate distinctly serru- 

 late ])oint, dee])ly concave, obsoletely bicostate, yellow at base, 

 pale above; cells short, narrow, linear, the alar vesiculose, dark 

 yellow ; pericha^tial leaves broadly ovate, passing into a long 

 denticulate suberect point : capsule small, oval, slightly inclined, 

 chestnut-color; operculum short, conical; segments whitish, 

 scarcely cleft; cilia single, as long as the segments, very slender, 

 punctulate. — Regensb. Flora, Iviii. 91 (1875). II. circinale, 

 Sulliv. & Lesq. Muse. Bor.-Amer. Exsicc. (ed. 2), n. 474. 



IIab. California, on trunks of Sequoia sempermrens {Bolander). 



Probably a variety of the last. The characters indicated above do not 

 appear important enough to authorize a separation, the mosses of this 

 section, especially those of California, being extremely variable. The 

 unequal base of the leaves, auricled on one side only, is distinctly marked 

 in fig. 4 of Hooker's plate of //. circinale, representing an enlarged leaf, 

 and the capsule is represented as more incurved than Mueller describes it; 

 the areolation is not described or figured by Hooker, but he mentions the 

 yellow color of the processes. 



* * Floioei's dioecious. 



154. H. callichroum, Brid. Dioecious or pseudo-monce- 

 cious : tufts soft, tumid, bright green ; stems slender, flexuous, 



