14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ^2 



THUIDIACEAE 



THUIDIUM PALLIDISETUM Dixon, Smiths. Misc. Coll. 69S: 8. 1918 



Without number. The material agrees perfectly with Diimmer's 

 original plant from Kipayo. The leaf cells are perhaps a little more 

 distinct and pellucid. 



HYPNACEAE 



STEREODON CUPRESSIFORMIS (L.) Brid. 



Nearly a dozen numbers contained this cosmopolitan species, in 

 very varying forms. Three of them (Nos. 3445b, 3756g, 3756h) 

 represent a slender form, with narrow leaves and slender tapering 

 branches, which I have no doubt is the Hypnum HoeJinelii of C. 

 Muller; but they cannot be separated from the species, though 

 perhaps quite deserving of varietal rank, and I should call it Stcreodon 

 cuprcssifonuis (L.) var. Hoehnelii (C. M.) Dixon, comb. nov. 



ECTROPOTHECIUM LATERITICOLUM Broth. 



Without number. In good though somewhat old fruit. I have not 

 seen a specimen of the original plant, but the present specimen agrees 

 perfectly with the description. The only point of doubt would be 

 in the habitat, since the specific name of Brotherus implies a station 

 on stonework or brickwork; but this is not of great importance, 

 and it becomes still less so in view of the prevailing tendency towards 

 an arboreal habitat shown by the mosses of this locality. 



RHAPHIDOSTEGIUM ELGONENSE Dixon, sp. nov. 



(PI. 2, fig. 9.) 



§ Aptychus. Stirps, quoad species africanae spectantur, R. 

 brachythcciiforuii (C. M.) et R. rivulet oriim (C. M.) proxima. Sat 

 robustum, Havo-aurcuin, ramis tiirgidis, brevissime cuspidatis; folia 

 dense imbricata, saepius vix secunda, rarius paullo assurgentia, apici- 

 bus falcatis, 1.25- 1.5 mm. longa, ovato-oblonga, supra cito angustata, 

 hrcvitcr acute aciuninata, saepe semitorta, concava, marginibus 

 anguste explanatis, planis, vel angustissiinc rcciirvis, integerrimis ; 

 areolatio perangusta, pcUitcida, ccllidis basilaribiis aiiraiitiacis, alari- 

 bus trinis inagnis inflatis, supra-alaribus nonnullis majusculis pellu- 

 cidis. 



Atitoictim. Folia perichaetialia foliis caiilinibiis subsiiiiilia, paullo 

 latiora, magis sensim acuminata, acumine latiore, sitbi)iteg)'o, interna 



