Trichosteleiim] mossjss (Gtipp). 303 



This species, which bears a misleading resemblance to the Hyluhijiia 

 section of the genus Ilooheria, is nearly allied to T. truncatulum Jaeg. 

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

 caule Broth, from the Oameroons (Dusdn, 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. Soc. xii. p. 496 (1869). 



1. T. stenosekos. 



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

 XXI. ii. p. 438. t. i. fig. 2 (1872). Isopterygmm stenosekos Jaeg. 

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



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

 the Cnanza river at Condo and Mata de Qnisonde ; specimens with 

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

 fr. March 1857. No. 98. 



The foliage of this species is compressed as in T. compresslcaule 

 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 csespitose, 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 wanting ; 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 papillse on the leaf -cells. It is quite distinct from 

 T. compressicauh Broth. (Oameroons, Dus^n, No. 758) in habit, and 

 from T. rotundatulmii, Broth. (Cameroons, Duson, No. 703) in habit, 

 leaf-shape and papillse. 



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



1. I. Welwitschii Gepp, sp. n. 



Autoicous. Plant densely and widely csespitose, depressed, 

 slender, flavescent green, glistening ; stem longly creeping, 

 pinnately branched; branches 15 mm. long, compressed, 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, 



