NO. 2 MOSSES OF AFRICAN EXPEDITION — DIXON 1 3 



The irregularity of the leaf margin, while not very conspicuous 

 and not always present, is of an unusual nature, consisting" some- 

 times of slight sinuosities or indentations, sometimes of slight pro- 

 tuberances, quite without system, as if the leaf had been badly cut 

 out with scissors ; it is not due in any way to erosion. 



LEPTODONTIUM PUMILUM (C. M.) Broth. 



Loc. 4,200 meters, No. 1660. A small plant, with rather close, 

 appressed foliage when dry, which agrees well with C. M tiller's 

 description. There is a peculiarity about the basal areolation, how- 

 ever, which the author does not mention, but which may well have 

 escaped attention. The basal juxta-costal cells are rather widely 

 rectangular, and pellucid, extending to about half the width of the 

 lamina ; the marginal row consists also of pellucid, short, quadrate 

 cells ; and between this and the juxta-costal ones there lies a band 

 of narrower, linear-rectangular, bright golden-yellow cells (cf. pi. 

 1, fig- 6). 



LEPTODONTIUM JOANNIS-MEYERI C. M. 



Loc. 3,630 meters, No. 1546. I have not been able to see a speci- 

 men of the original, from Kilimanjaro, but I have no doubt this is 

 C. Muller's plant. From the leaf structure it appears to me probable 

 that the fruiting characters when known may show this to be a 

 Leptodontiopsis. 



LEPTODONTIOPSIS ELATA Dixon, sp. nov. 



(Plate 1, fig. 3) 



L. fragilifoliae Broth, affinis, sed mnlto elatior, 10-12 cm. alta, 

 foliis hand vel mini me fragilibus, plerumque ad summam apicem 

 integris, rarissime denticulatis, siccis flexuoso-crispatis hand appres- 

 sis, flavo-aurantiacis. Fructus caret. 



Hab. : Loc. 3,630 meters, No. 1557. 



A fine species, clearly — though sterile — allied to Brotherus' plant 

 from Karisimbi in the volcano region and from Ruwenzori, but 

 differing sufficiently, I think, in the characters italicized to be kept 

 distinct. Brotherus figures his species as having the extreme apex 

 of the leaf crowned with a few subpellucid denticulations ; these 

 occur occasionally, but very rarely, in the present plant, where the 

 leaf usually ends in a quite entire, fine, subpellucid point. The basal 

 cells are — as in L. frdgilifolia — linear, highly incrassate, and with 

 the walls porose. 



