Plagiochila] hepatics (Stephani). 315 



2. P. decurrens Steph. sp. n. 



Dioicous. Plant rather small, slender, densely csespitose, 

 olivaceous. Stem up to 4 cm. long, very much and almost fascicu- 

 lately branched ; branches subsimple and pinnately divided at 

 the top into short floriferous branchlets. Leaves not spreading 

 much from the stem (at an angle of 30°), obliquely oblong, on the 

 postical side shortly inserted, longly incumbent on the stem, on 

 the antical side very longly decurrent, at apex truncate bi- 

 tridentate, upper margin sparingly dentate, the teeth being 

 widely triangulate and short. Apical cells 17 /x, median 17 by 

 25 /A, basal 17 by 35 /a ; ti'igones rather large. Perianths 

 terminal on ultimate branchlets, oblongo-obcuneate, on one side 

 winged, at apex truncate, closely and equally dentato-spinose, the 

 spines being slender and setaceous at apex. Innermost floral 

 leaves from a narrow base obliquely ovate, at apex subtruncate, 

 margins everywhere grossly crenato-spinose, quite entire at the 

 base only. 



The original specimen was gathered by Dusen in the Cameroons. 

 The species is most distinct ; it is easily recognised by its very 

 decurrent leaves, and can be compared with no other species 

 hitherto known. 



GoLUNGO Alto. — On old trunks by rivulets in Alta Queta; July 

 1857. No. 280. 



3. P. divergens Steph. in Hedwigia, xxx. p. 268 (1891). 

 GoLUXGO Alto. — On continually wet rocks by the cataracts of the 



Cuango river near Sange; Aug. 1855. No. 303. In Mata de Quisu- 

 cula, near Bango Aquitamba; Jan. 1856. No. 303&. 



4. P. prsemorsa St«ph.inEngl.Bot.Jahrb. viii.p.92,fig.l-3(1887). 

 PuNGO A>'DOXGO. — On trunks near the ground in Mata da Pedra 



Pungo; May 1857. No. 234. 



GoLUXGO Alto. — On schistose rocks near the rivulet of Capopa; 

 Oct. 1854. No. 298. In Mata de Quisucula; Feb. 1855. No. 304. 



5. P. strictifolia Steph. in Hedwigia xxx. p. 210 (1891). 

 Goltingo Alto. — Among mosses on the banks of the Cuango river; 



June 1856. No. 221. With Thuidium gratum (No. 143), Alta Queta; 

 Jan. 1856. No. 271. On Xipepe {Monodora angolensis) and other trees, 

 Alta Queta; March 1856. No. 273. Quisucula ; Feb. 1855. No. 290. 

 Mixed with Eulejeunea Ecklonii amongst mosses (Rhynchostegmm, etc.) 

 on rocks on the banks of the Coango river near Sauge; June 185ti. 

 No. 325. Cataract of the Quango river; 5 July 1856. No. 326. 



6. P. thomeensis Steph. in Engl. Bot. Jalirb. viii. p. 81 (1886). 



GOLUNGO Alto. — With Porotrichum elongatum {at. No. 146), Quisu- 

 cula; Feb. 1856. No. 274. In the woods of Sobado Quilombo; July 

 1856. No. 291. On trunks of old trees by the side of a rivulet, 

 Zengas da Queta ; one specimen found with fr. May 1856. No. 324. 



Cazengc— On the right bank of the river Luinha, Mata de 

 Muxaftla; Jan. 1855. No. 275. 



To this genus are referred the following numbers : — 



Island op St. Thojias.— Ceespitose, intensely green, in company 



