NO. 2 MOSSES OF AFRICAN EXPEDITION — DIXON II 



correlated with a taller, laxer habit of growth. Moreover, one single 

 gathering (No. 1594) showed forms ranging from the shortest- 

 leaved state to one with very long if not quite the longest leaves. 



It occurred to me to examine Mitten's type from the Cameroons, 

 collected by Mann, at Kew, and to my surprise I found both these 

 forms represented there. Mann's specimens are on three sheets, 

 two of them the short-leaved form, the third consisting of two fine 

 fruiting tufts with silky, elongate leaves up to 7 mm. at least. As 

 the fruiting plant, this last would probably have to be considered 

 the type. In any case it is clear that there is no room for a new 

 species, nor do I think any of the forms sufficiently marked or con- 

 stant to be given varietal rank. 



From the description I am strongly inclined to think that C. 

 sericeus Negri, from Ruwenzpri, is the long-leaved form of this 

 species (the locality is very close to that where C. substramineus 

 Broth, was collected), and this in spite of the fact that the author 

 describes it as exhibiting stereids in the dorsal band of the nerve. 

 Brotherus, quite rightly I believe, places C. strainiueus in the section 

 Pseudocampylopns, the nerve generally, and in the lower part no 

 doubt constantly, showing a median row of guide cells and a dorsal 

 row of subequal moderately lax cells, but no stereids. On cutting- 

 sections of the upper part of the leaves, however, I have found here 

 and there a small number of decided stereid cells, intermixed with the 

 dorsal, and I am therefore of the opinion that their presence in 

 C. sericeus Negri does not entirely preclude its identity with C. 

 stramincus. 



CAMPYLOPUS PROCERUS (C. M.) Par. 



Hab. : Bamboo zone, western slopes of Mt. Kenia, along the trail 

 from West Kenia Forest Station to summit, at about 3,000 meters 

 elevation, No. 1729. A slightly denser form with leaves a little 

 closer than the original from Kilimanjaro, with which, however, it 

 agrees otherwise. 



CAMPYLOPUS JOANNIS-MEYERI (C. M.) Par. 

 Loc. 4,200 meters, No. 1658. I have not been able to see an original 

 specimen, but from the description I have no doubt that this is the 

 same as the plant from Kilimanjaro. It is in one respect a remark- 

 able species : the nerve section betrays no sign of stereids ; it consists 

 of a ventral row of very large empty cells, a row of much smaller 

 guide cells, and a single row of subequal and very similar dorsal cells ; 

 the cells of both these layers become somewhat substereid in the 



