NO. 2 MOSSES OF AFRICAN EXPEDITION — DIXON 21 



BREUTELIA STRICTICAULIS Dixon, sp. nov. 



(Plate 2, fig. 8) 



Habitu B. subgnaphalcac (C. M.) sed caulibus plerumque per- 

 strictis, subsimplicibus vel breviter distanter parce ramosis, 15 cm. 

 altis vel ultra, stramineis, infra fuscis, hie illic usque ad apicem 

 tomentosis. Folia 4-5 mm. longa, e basi brevi pluriplicata erecta 

 raptim dcHcxa, hinc sensim attenuata, breviuscule acute acuminata, 

 siccitate parum contracta, leniter plicata. Costa sat angusta, in 

 cuspidem rigidiusculam subflexuosam dentatam excurrens. Folii 

 ■margines omnino plant, inferne denticulati, superne dentibus tcnuibus 

 augustissimis argute ciliolati. Cellulae basilares angustissime line- 

 ares, laeves, marginales hand vel vix latiores, superiores lineares, 

 unaquaque papilla alta in angulo inferiore instructa, marginales 2-3 

 seriebus omnino laeves, limbum paullo pellucidiorem instruentes. 



Bracteae perigoniales internae obtusae vel subobtusae, evanidi- 

 nerviae, basi pulchre aurantiacae. 



Cetera ignota. 



Hab. : Loc. 3,630 meters, No. 1541. 



In many respects like B. subgnaphalea (C. M.), but more rigid 

 and with certain structural differences of some importance. The 

 leaves in that species taper very gradually to a very acute apex, with 

 a longer, more flexuose filiform point, formed by the excurrent 

 nerve ; here they narrow rather rapidly and shortly, with a shorter, 

 more rigid point. The upper denticulation in that is much finer 

 with short, scarcely at all ciliolate teeth, and the border of smooth 

 cells is almost or quite wanting. ( Cf. pi. 2, figs. 8c, pc.) 



POLYTRICHACEAE 



POLYTRICHUM KENIAE Dixon, sp. nov. 



(Plate 2, fig. 10) 

 Robustum; caules ad 25 cm. alti vel ultra, infra cum foliis 

 squamiformibus castaneis appressis subobtusis mucronatis teretes, 

 nullo modo radiculosi, superne dense foliosi ; folia madida patentia, 

 sicca magis erecta, rigidiuscula, interdum appressa, inde frondem 

 subteretem sistentia, 1-1.5 cm. longa, e basi nitidiuscula aurantiaca 

 vaginante decurrente praclonga 1/3 folii longitudincm acquante vel 

 super ante, in laminam lanceolatam sensim acuminatam producta, 

 apice dorso-spinoso, marginibus (parte basilari excepta) argute, 

 spinose, sat distanter grosse dentatis. Cellulae superiores valde in- 

 crassatae, subquadratae, lumine 7-12 fx lato, inferiores lineares, 

 angustissimae, parietibus valde' tenuibus. Lamellae 30-40. apice in- 



