406 MUSCI. Hookeria. 



middle, nerveless : capsule subspherical, minute, with broad convex-conic operculum : 

 teeth frequently bifid at the apex, incurved when moist, reflexed when dry. 

 Schwaegr. Suppl. t. 99 ; Bruch & Schimp. Bryol. Eur. t. 450, excl. fig. 6 ; Sulliv. 

 & Lesq. Muse. Am.-Bor. Exsicc. 2 ed. n. 375. 

 On the bark of trees, Oakland (Bolander) ; Southern Europe. 



47. HOOKERIA, Smith. 



Prostrate succulent deep-green and shining perennials, in springy places, loosely 

 cespitose and irregularly branching ; branches flattened, ascending. Leaves large, 

 complanate, obliquely imbricated and spreading laterally, ovate or rounded, obtuse 

 or acuminate, bicostate or nerveless, with very loose round-hexagonal areolation. 

 Flowers monoecious, lateral, bud-like. Calyptra conic-mitriform, lobed at base, 

 smooth. Capsule ovate or elliptical, horizontal or cernuous, long-pedicellate ; oper- 

 culum conic-rostrate ; annulus obscure or none. Peristome double ; the outer of 16 

 firm closely-jointed linear-lanceolate teeth; the inner of 16 carinate processes, 

 alternate with and equalling the teeth, upon a plicate basilar membrane ; ciliolae 

 none. Pterygophyllum, Brid. 



As understood by Mueller the genus includes over 70 species, chiefly of the Southern hemi- 

 sphere. It is variously limited and divided by other authorities. In any case, however, the 

 generic name must be retained for the typical species //. lucens, whatever other species may be 

 united with it. 



* Leaves nerveless, entire. 



1. H. acutifolia, Hook. (?) Stem creeping, somewhat branched, an inch or two 

 long : leaves ovate-oblong, acute, nerveless, entire : capsule oblong, horizontal upon 

 a pedicel an inch long, brown ; operculum conic-rostrate : teeth reddish brown, the 

 inner yellowish. Schwaegr. Suppl. t. 163; Sulliv. in Gray's Man. 2 ed. 666; 

 Sulliv. & Lesq. Muse. Am.-Bor. Exsicc. n. 270 (2 ed. n. 401); Lesq. Mem. Calif. 

 Acad. i. 29. 



Deep Canon, Monte Diablo (Bolander) ; Atlantic States. Fruit unknown, and the plant there- 

 fore referred with doubt to Hooker's species, which is otherwise known only from India. 



H. LUCENS, Smith. Stems 1 to 3 inches long : lower leaves rounded, the upper broadly ovate- 

 oblong, obtuse, entire : pedicel an inch long : capsule more or less cemuous, oval, chestnut- 

 colored becoming blackish, the large yellow operculum long-beaked : peristome reddish, the 

 inner processes dehiscent along the keel. Trans. Linn. Soc. ix. 276 ; Engl. Bot. t. 1902 ; 

 Wilson, Bryol. Brit. t. 27 ; Fl. Dan. Suppl. t. 49. Leskea luceiis, Schwaegr. Suppl. t. 84. 

 Pterygophyllum lucens, Brid. ; Bruch & Schimp. Bryol. Eur. t. 448. Oregon (Hall) ; Europe. 



* * Leaves costate, serrate. 



H. ANOMALA, Muell., was collected on the western coast by Mcnzics. It is more erect and 

 branched, with dusky green foliage, the leaves more remote and spreading, broadly ovate-oblong, 

 narrower toward the base, acutish, coarsely and remotely serrate, 1 -nerved to the middle with an 

 obscure shorter lateral nerve. Syu. ii. 204. Racopilum anomalum, Schwaegr. Suppl. t. 278. 



48. PTEROGONIUM, Swartz. 



Secondary stems erect or ascending, the branches more or less fascicled, arcuate 

 especially when dry. Leaves not complanate, bicostate at base. Calyptra sparingly 

 hairy. Teeth of the peristome short-lanceolate ; processes short, scarcely reaching 

 to the middle of the teeth, upon a broader basilar membrane. Otherwise as the 

 preceding. 



As limited by Schimper the genus includes only the following species. 



1. P. gracile, Swartz. Yellowish green ; stems 1 or 2 inches high, the branches 

 obtuse or filiform-attenuate : leaves closely imbricated, ovate and acute or ovate- 



