NO. 2 MOSSES OF AFRICAN EXPEDITION — DIXON 7 



carried on in the higher altitudes of the Central African ranges, and 

 especially among the cryptogamic flora of those altitudes, for it is 

 there that the data necessary for the solution of the problem will 

 most likely be found. 



The following species are described here for the first time : 

 Sphagnum Keniae, Hymenostyliuui crassinervium, Leptodontiopsis 

 elata, Rhacomitrium defoliation, Bryum piano-mar ginatum, Philo- 

 notis speirophylla, Breutelia stricticanlis, Polytrichnm Keniae, Hy- 

 groamblystegium procerum, Collier gon Keniae, Isopterygium serici- 

 folium, Rhynchostegiella Keniae. The types of these are in the 

 United States National Herbarium, duplicate types being in my 

 own collection. 



My thanks are due to Dr. Brotherus and to Mons. Theriot for 

 assistance in the identification of certain of the species, and to the 

 authorities of the. British Museum and Kew collections for the 

 opportunity of comparing specimens in these herbaria. 



In the following list I have followed the order of Brotherus 

 (Engler & Prantl, Pflanzenfamilien, Musci). 



To save repetition I have used the following terms for the two 

 collecting localities which occur most frequently : 



" Loc. 3,630 meters." Western slopes of Mt. Kenia, along the 

 trail from West Kenia Forest Station to summit, at about 3,630 

 meters, in the " giant heath zone," Sept. 21-27, 1909. 



" Loc. 4,200 meters." Western upper slopes of Mt. Kenia, above 

 the " giant heath zone," along the trail from West Kenia Forest 

 Station to summit, at about 4,200 meters elevation, Sept. 25-27, 1909. 



It may be possible to gain some idea of the prevailing species on 

 Mt. Kenia from the number of gatherings made of some of them. 

 Judged in this way the most frequent mosses would be : Campylopus 

 straiiiineus (Mitt.) Jaeg., 13 gatherings; Tortula Cavalli Negri, 9 

 gatherings ; Bartramia ruvcnzorensis Broth., 5 gatherings ; Grimmia 

 ovata Web. & Mohr, 5 gatherings. None of the others are repre- 

 sented by more than three gatherings each. 



SPHAGNACEAE 

 SPHAGNUM KENIAE Dixon, sp. nov. 



(Plate 1, fig. 1) 



§ Subsecunda. Caules breviusculi, ut videtur laxe caespitosi, flavo- 

 virides, infra pallide fuscescentes, habitu 6". mollnsci Bruch. Rami 

 perbreves, raro I cm. longi, plerumque multo minus, obtusi, dense 

 conferti. 



