NO. 3 BRITISH EAST AFRICAN MOSSES — DIXON 5 



ORTHOTRICHUM UNDULATIFOLIUM C. M. 



Tree heaths, western crater Hp, 13,000 ft. ; No. 3407c, c. fr. jun. 

 From the description there can be no doubt, I think, that this is C. 

 Miiller's plant. 



ORTHOTRICHUM LEIKIPIAE C. M. 



Tree heaths in crater, 13,000 ft.; No. 3417b (p.p.), c. fr. A 

 fertile stem mixed with Braunia. The endostome segments are as 

 described by C. ]M tiller, unusually broad, almost, in fact, connivent 

 at base. The plant is no doubt nearly allied to 0. speciosum. 



MACROMITRIUM HYALINUM Broth. 

 No. 3766, c. fr. 



MACROMITRIUM ABYSSINICUM C. M. 



Tree heaths, 12,000-13,000 ft. ; No. 3413, c f r. ; No. 3756b, forma 

 laxiramea, c. fr. 



After careful comparison of M. hyalinimi Broth, with M. abys- 

 sinicujii I feel very doubtful whether the two can be kept separate. 

 Brotherus rests his species on the smaller size and the very acute 

 leaves, often with hyaline tip. Comparison of Hoist's Usambara 

 plant, however, with M. ahyssinicum (No. 431, Schimp. Iter Abyssin., 

 in Schimper's herbarium) shows no difference, or at any rate no 

 constant difference, in leaf. The Central African plant appears as 

 a rule to run rather smaller than the Abyssinian specimens, but this 

 is by no means constantly the case and Diimmer's No. 3413 is as 

 robust as any of these. No. 3766 is smaller and agrees in dimensions 

 with Hoist's plant, and I have retained it provisionally under M- 

 hyalimmi. 



No. 3756b is a very peculiar plant. The stems are elongate, robust, 

 distantly and fairly regularly pinnate, apparently pendulous, with 

 none of the habit of a Macromitrium, but closely resembling some 

 forms of Papillaria. The leaves are very acutely long-acuminate, 

 often with the apex half-twisted, and when dry somewhat recurved. 

 I do not think, however, that the leaf form must be considered as 

 of any importance in comparing it with M. ahyssinicum (type), as 

 the leaves with which one is familiar there are the branch leaves, 

 while owing to the peculiar growth of this plant the bulk of the leaves 

 probably, and of course those of the primary stem, are of the nature 

 of stem leaves. A seta and capsule in my specimen are identical with 

 those of M. abyssitiicuui, while the specimen of No. 3413 in the Wash- 



