406 ' MCSCI. Jloolwrin. 



middle, nerveless : capsule subsjilierical, miiuito, with liroad convex-conic oj)erculum : 

 teeth frequently bitid at the apex, incurved when moist, reHexed when dry. — 

 Schwaegr. Supjil. t. 99 ; r>ruch & Schinip. Bryol. Eur. t. 450, excl. fig. G ; Sulliv. 

 & Lesij. Muse. Ani.-Bor. Exsicc. 2 ed. n. 375. 



Ou the bark of trocs, Oakland {Boluiidcr) ; Southein Eurojte. 



47. HOOKERIA, Smitli. 

 Prostrate succulent deep-green ami 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, l)icostate or nerveless, with very loose round-hexagonal areolation. 

 Elowers monoecious, lateral, l)iid-like. ('alyptra coiiic-mitriform, lo1)ed at base, 

 smooth. Caj)sule 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 mend)rane ; ciliuhu 

 none. — PteryrinphyHum, Brid. 



As understood by Mueller tlie gpiiiis iticludfs over 70 si)ooios, cliiefly of the Southern henii- 

 sjihere. It is variou.sly limited nnd divided hy other iiuthoiities. In any ease, however, the 

 generic name nnist be letaineil for the typieal sixcies //. luccns, whatever other .si)e(ie.s may be 

 united with it. 



* Leaves ncvveless, entire. 



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

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

 a pedicel an inch long, brown ; operculum conic-rostrate : teeth i-eddish Ijrown, tlio 

 inner yellowish. — Schwaegr. Suppl. t. 163; Sulliv. in (iray's Man. 2 ed. 66(5; 

 Sulliv. & Lesq. Muse. Am.-Bor. Exsicc. n. 270 (2 ed. n. 401); Lcscp i\Iem. Calif. 

 Acad. i. 29. 



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

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



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

 oblong, obtuse, entire : pedicel an inch long : capsule more or less ceniuous, oval, chciitnut- 

 colored t>econiing blackish, the laige yellow operculum long-lwaked : peristome reddish, the 

 iinier processes dehi>cent along the keel. — Trans. Linn. Soc. ix. 276; Engl. Hot. t. li)0'2 ; 

 Wilson, Bryol. Brit. t. 27 ; Fl. Dan. Supjd. t. 49. Lfskra liicois, Schwaegr. Suppl. t. 84. 

 Pkrygophyiluni luccns, Brid. ; Bruch k Schimp. Bryol. Eur. t. 448. Oregon {Hull); Euro])e. 



* * Leaves costate, serrate. 



H. ANO.MAIA, Muell., was collected on the western coast by Meicirs. It is more erect and 

 branched, with dusky green foliage, the leaves more remote and spieading, broadly ovafe-ohlong, 

 narrower toward the ha.se, acutish, coar.sely and remotely serrate, 1 -nerved to the middle with an 

 obscure shorter lateral lu-rve. — Syn. ii. 204. Uneopilum anonKilutn, Schwaegr. Suppl. t. 276. 



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 sliort, scarcely reaching 

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

 Ijreceding. 



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



1. P. gracile, Swartz. Yellowish green ; stems 1 or 2 imhes high, the brandies 

 obtuse or liliturm attenuate : leaves clo.Mly imbricated, ovate and acute or ovate- 



