312 MB. W. MITTEN* ON MOSSES AKD 



dentibus brevibus divergentibus armata, inferne ut plurimum 

 bisulcata e cellulis minutis areolata punctulis asperula. 



Hah. Kilimanjaro, Bishop Hannington. Transvaal, Br. Beh- 

 mann. Also in Mauritius ? 



Very nearly resembling P. densus, C Miill. (Bypnum^ Sw.), 

 from Jamaica, Mexico, and Tropical America — regions in which 

 that species is now known to be accompanied by many others, 

 but until the discovery of the African species none was known 

 to have been found elsewhere. 



Pteeobetfm, HornscTi, 



P. PLA^GELLiFEEUM, sp. n. (PI. XVI. figs. 1-3.) Eaml in- 

 ferne breviter stipitati flexuosi, ramulis variis pinnati flagellis 

 minute foliatis gracilibus ; folia patentia ovato-lanceolata, nervo 

 infra apicem planum desinente caviuscula integerrima, cellulis 

 elongatis, perichsetialia anguate oblongo-laaceolata sensim angus- 

 tata supra medium nervata, theca ovato-oblonga operculo convexo 

 brevi acumlnato, duplo longiora, integerrima. 



Hob. TJsagara Mountains, Mr. Last. 



P. Ha:nkinotont, sp.n. (PI. XV. figs. 20-22.) Eami a caule 

 primario rhizomgeformi ascendentes subplumsef ormes, curvuli ; ra- 

 mulis plurimis patentlbus distichis fere ad basin usque piuuatis ; 

 folia patentia laxe imbricata ovato-lanceolata parum acuminata 

 coneava sicca subplicata, nervo infra apicem planum desinente 

 integerrima e cellulis elongatis areolata, perichsetialia oblongo- 

 lanceolata subulate attenuata ad | usq^ue nervata, thecam oblon- 

 gam \ superantes. 



Hah. Usagara Mountains, 



Both these species are nearly allied to the South-American 

 P. trichomanoides, Spruce, B.Jilicinum^ Sw., and P. angmtifolmm, 

 C. Miill. ; and although very nearly resembling each other, when 

 once the differences are apprehended are readily separable. 



Ha 



ch- 



letsanda denser foliage, besides the differences in theperichsetium. 



Calyptothecium, Mitt. 



C. APEiCANUM (Trachyloma, Behm.). 



Hah. Kilimanjaro, Bishop Hannington. Usagara Mountains, 

 Mr. Last^ gathered also by Burchell. All the specimens 

 barren. 



