218 
Transactions of the Royal Society of South Africa. 
it, but has more shortly pointed leaves wider at base. (M. Shawii Eehm. 
ined. is very similar to M. horridulvm, if indeed distinct from it.) Gtenidium 
squarrifolium (C. M.) from the Cameroons is much like it, but is dioicous. 
The autoicous inflorescence is the principal argument, perhaps, for placing 
this present species in Microthamnium, some other species of which also are 
very closely related to species of Ctenidium. 
M. patens (Hampe) Jaeg. Barberton, Transvaal, 1914 ; coll. H. A. W. 
(No. 252), c. fr. 
M. cyg7iicollum. (Hampe) C. M. Kaapsche Hoop, 6000 ft., Transvaal, 
1915 ; coll. H. A. W. (No. 294), c. fr. ; near Hogsback, 4-6000 ft., Tjumie, 
CP., 1916; coll. Hend. (No. 219), c. fr. 
M. pseudo-reptans C. M. Kaapsche Hoop, 1915 ; coll. H. A. W. 
(No. 329 p.p.), c. fr. 
M. cavifolium (Rehm.) Dixon. Kaapsche Hoop, 1915 ; coll. H. A. W. 
(Nos. 293, 316, 318), c. fr. 
Stereodon aduncoides (C. M.) Broth. Knysna Forest, CP. ; coll. W. C 
Worsdell (No. 7). Agrees quite well with the Bourbon plant ; the single 
row of marginal basal cells, wide and hyaline, is characteristic. Hitherto 
recorded from Bourbon and Madagascar. 
Isopterygium hrachycarjmm Dixon sp. nov. (PL XII, fig. 19.) 
Caules dense intertexti, caespites densos, saturate vel laete virides nitidos 
formantes, plus minus conferte ramosi, ramis brevibus, obtusis. Folia 
subcomplanata, late patentia, saepius falcato-secunda, e basi coarctata late 
ovato-oblonga, hreviter acutissime acuminata, concava, apice Integra vel 
obscure denticulata, costa brevissima, gemella ; folia ramea brevius acumi- 
nata vel tantum acuta ; cellulae peranguste lineares, vermiculatae, 5-6 latae, 
apicem basinque versus pauUo latiores, alares 2-4, majusculae, vesiculosae, 
hyalinae, supra-alares perpaucae, irregulariter subquadratae. 
Autoicum. Perichaetium breve, foliis acumine breviter subulato, integro, 
internis erectis, in acumen breviter loriforme flexuosum subsquarrosum 
ahrupte coarctatis, basin versus acuminis saepius irregtilariter grossiuscule 
2-3-dentatis. Seta tenuis, vix 1 cm. alta ; tlieca parva, hrevis, elliptica, collo 
vix ullo ; operculum conico-rostellatum, curvatum. 
Iftife.— Knysna, CP., coll. H. A. W. (No. 512) ; Eietfontein, Trans- 
vaal, coll. H. A. W. (No. 234). 
Distinct from the previously described African species, especially in the 
short, thin seta, small, elliptical capsule, passing abruptly at the base into 
the seta ; and markedly in the inner perichaetial bracts, which nearly 
always have a striking toothing somewhat similar to that in Plagiothecium 
Miquelii from the East Indies (cf. fig. XII). 
No. 234 was sent as " Plagiothecium suhrhynchostegioides Broth. & 
Wager n. sp.. Broth, in litt. ad H. A. Wager." I find it, however, to be 
identical with the previously sent plant which I had already reported and 
