Trichoatelwm | hosbes m fepp). 303 
Tliis species, which bears a misleading resemblance to '••■ // 
section of the genus Hookeria, is nearly allied to T. truncatul 
el Sauerb. gathered in Peru 1>\ Poppig ; also to Tcucithelium perplani- 
Broth, from the Cameroons (Dub&i, No. 704), bul in thai plant 
the leaves are not papillate. 
!9. TAXITHELIUM Spruce Oatal. Muse. p. II (1867); 
Spruce ex Mitt, in Journ. I. inn. Soc. .\ii. p. t96 < 1 - 
1 . T. stenosekos. 
Uypnum stenoaekos Welw, ei I Mil., in Geneve, Mem. Soc. Phys. 
XXI. ii. \>. 438. t. i. fig. 2 (1872). Isopterygium stenoaeh 
el Sauerb. Gen. el Spec. Mum-, ii. p. 503 (1878). 
I'i ngo A.ndongo. On old tree trunks near the great cataraci oi 
the Cuanza river at Condo ami .Mala de Qnisonde ; specimens with 
opercula and with \ igcalyptras gathered in the same place ; with 
ir. March is;, 7. No. 98. 
The foliage of tin- species is compressed as in /. conqm 
Broth, from the Cameroons (Dusen, No. 758), but the l< 
Welwitsch's plant are short* r, more obtuse, with the alar cella larger 
and colourless, and the upper cells seriately papillate. 
2. T. andongense Gepp, sp. n. 
Widely csespitose, lutescent-green, dull; luanclm- elongate, 
creeping, Btraggling, here and there attached bj rootlets, 
pinnately branched; branchlets up to 2 cm. long, patulous, 
ilexun.se, compressed, laxly foliose, obtuse; ramuline leaves laxly 
imbricate, patent, concave, from a constricted base oblong or 
ovate-oblong, very shortly acuminate or obtuse and terminate. i 
by short apiculus ; mar-ins erect, al apex minutely denticulate : 
nerves wanting; oils elongate, very narrow, smooth or bearing 
a single median dorsal papilla (more randy two seriate papillae) ; 
alar cells .') to ft. vesicular, hyaline; supra-alar tew. hyaline. 
quadrate. Inflorescence, fruit, etc., wanting. 
I'i ngo Audongo. In the shaded woody parts of Barranco de Pedra 
de Sin Antonio : sterile. May 1857. No 112. 
This species differs from the preceding in heing of a deeper green 
colour am! of a Btraggling and more irregular babit, Imt especial!] in 
the scarcity of papillaa on the leaf-cells. It is quite distinct Erom 
/'. compressicaule Broth. (Cameroons, Dusen, No. 758) in babit, and 
Erom /'. rotwtdatulum Broth. [Gamer is, Duse'n, No. 703) in hal.it. 
leaf-shape and papilla?. 
Hi. ISOPTERYGIUM .Mitt, in Journ. Linn. Soc. xii. p. 197(1869) 
1. I. Welwitschii Gepp, sp. n. 
Autoicous. riant densely and widely CfespitOSe, d( | 
slender, flavesceni green, glistening; .stem longly creeping, 
pinnately branched; branches l"> mm. Long, compressed, with 
rather dense foliage; branchlets pinnately arranged, •"> toft mm. 
long, compressed, acute; leaves complanate, laxly iml 
rather concave, from a contracted base obliqui ly ovato lai • 
acuminate, rather rugulose, with margins more or Less revolute, 
serrulate minutely above and very minutely belov. ; nerves two, 
