Trichostelearn] mosses (Oepp). 303 



This species, which bears a misleading resemblance to the Hi/luhiji/a 

 section of the genus Jlookcr/a, is nearly allied to T. truucatuluiii, Jaeg. 

 et Sauerb. gathered in Peru by Poppig ; also to Taxithelium perplaw- 

 caule Broth, from the Cameroons (Dusen, No. 704), but in that plant 

 the leaves are not papillate. 



39. TAXITHELIUM Spruce Catal. Muse. p. 14 (1867); 

 Spruce ex Mitt, in Journ. Linn. See. xii. p. 496 (1869). 



1. T. stenosekos. 



Uypnuin stenosekos Welw. et Dub. in Geneve, Mem. Soc. Phys. 

 XXI. ii. p. 438. t. i. tig. 2 (1872). Isopterygium stenosekos Jaeg. 

 et Sauerb. Gen, et Spec. Muse. ii. p. 503 (1878). 



PuNGO Andongo. — On old tree-trunks near the great cataract of 

 the Cuanza river at Condo and Mata de Quisonde ; specimens with 

 opercula and with young calyptras gathered in the same place ; with 

 fr, March 1857. No. 98. 



The foliage of this species is compressed as in 2\ conqjressicaule 

 Broth, from the Cameroons (Dusen, No. 758), but the leaves of 

 Welwitsch's plant are shorter, more obtuse, with the alar cells larger 

 and colourless, and the upper cells seriately papillate. 



2. T. andongense Gepp, sp. n. 



Widely caespitose, luteseent-green, dull ; branches elongate, 

 creeping, straggling, here and there attached by rootlets, 

 pinnately branched ; branchlets up to 2 cm. long, patulous, 

 flexuose, compressed, laxly foliose, obtuse ; ramuline leaves laxly 

 imbricate, patent, concave, from a constricted base oblong or 

 ovate-oblong, very shortly acuminate or obtuse and terminated 

 by short apiculus ; margins erect, at apex minutely denticulate ; 

 nerves vsi'anting ; cells elongate, very narrow, smooth or bearing 

 a single median dorsal papilla (more rarely two seriate papillae) ; 

 alar cells 3 to 5, vesicular, hyaline ; supra-alar few, hyaline, 

 quadrate. Inflorescence, fruit, etc., wanting. 



PuNGo Andongo.— In the shaded woody parts of Barranco de Pedra 

 de San Antonio ; sterile, May 1857. No. 112. 



This species differs from the preceding in being of a deeper green 

 colour and of a straggling and more irregular habit, but especially in 

 the scarcity of papilhe on the leaf-cells. It is quite distinct from 

 T. comjircsskaulc Broth. (Cameroons, Dusein, No. 758) in habit, and 

 from T. rotuiidatuluno Broth. (Cameroons, Dusen, No. 703) in habit, 

 leaf -shape and papillae. 



40. ISOPTERYGIUM Mitt, in Journ. Linn. Soc. xii. p. 497 (1869). 



1. I. Welwitschii Gepp, sp. n. 



Autoicous. Plant densely and widely ca3spitose, depressed, 

 slender, flavescent green, glistening ; stem longly creeping, 

 pinnately branched; branches 15 mm. long,, qompres^d, with 

 rather dense foliage ; branchlets pinnately arranged, 3 to 5 mm. 

 long, compressed, acute ; leaves complanate, "laxly imbricate, 

 rather concave, from a contracted base obliquely ovato-lanceolate 

 acuminate, rather rugulose, with margins more or less revolute, 

 serrulate minutely above and very minutely below ; nerves two, 



