NO. 2 MOSSES OF AFRICAN EXPEDITION — DIXON 25 



5\ Hochnclii (C. M.). The description of that plant (which I have 

 not been able to see) seems to agree fairly well with this, but C. 

 Miiller describes the leaves as very narrow, which does not apply 

 here. I do not feel justified therefore in referring- No. 1570 to 5. 

 Hoelinelii — which I have no doubt is but a variety of 6". cupressifor- 

 mis; on the other hand I have a shrewd suspicion that it is really 

 C. Muller's plant. It is a very soft, prolix form, pale dull green with 

 very long flexuose stems having very few distant irregular branches, 

 slender, but not extremely so, and particularly marked in having the 

 leaves not at all falcate, but straight, suberect or slightly spreading, 

 and generally homomallous. It might perhaps be placed under var. 

 resupinatus (Wils.) Schimp., but I have not seen any form of that 

 variety at all approaching this in habit. 



ISOPTERYGIUM SERICIFOLIUM Dixon, sp. nov. 



(Plate 2, fig. 14) 



Autoicum. Dense caespitosum ; caules valde intricati, irregulariter 

 ramosi, pergraciles, condensati, cacspitcs deprcssos scriceos instru- 

 entes. Rami inaequales, 1-2 cm. longi, complanati, parcissime ramu- 

 losi, cum foliis vix ultra 1 mm. lati, saepe subflagelliformes, pallide 

 straminei, valde sericei, nitidi, molles. Folia 1 mm. longa, concava, 

 e basi parum angustiore oblongo-lanceolata, superne cito in acumen 

 tenuc subfiliforme flexuosum breviusculum attenuata ; marginibus 

 planis iutegerrimis. Costa geniclla, cruribus brevibus sed plerumque 

 bene notatis, inaequalibus, angustissimis. Areolatio densissima, e 

 cellulis angustissime lincaribus, valde prosenchymaticis, infra par inn 

 latioribus instructa, alaribus nullis. 



Flores masculi et feminei immaturi, apud ramorum basin siti. 

 Cetera ignota. 



Hab. : Loc. 3,630 meters, No. 1580. 



Belonging to the group of which the nearest continental African 

 allies are Isopterygium plumigerum (C. M.) Broth, and/, conangium 

 (C. M.) Broth.; but it is quite distinct from these. Isopterygium 

 plumigerum is not unlike it in aspect, but has quite different folia- 

 tion, the leaves being more distichous and widely spreading, while 

 here they point forward in a marked degree, their axis making only 

 a small angle with the stem, while the apex is still more incurved. 

 Most of the other allied species have the leaves also more or less 

 markedly denticulate. Isopterygium subleptoblastum C. M. re- 

 sembles it in leaf form and areolation, but is of a green color, and the 

 leaves are nerveless. 



