— 148 — 

 Grimmiaceae. 



Grimmia afro=incurva Broth, n. spec. -;- Dioica; gracilis, pulvinato-caespitosa, 

 caespitibus densissimis, mollibus, atroviridibus, opacis; caulis usque ad 3 cm 

 altus, erectus, inferne fusco-radiculosus, dense foliosus, dichotome ramosus, ramis 

 fastigiatis; folia sicca erecto-crispula, liumida erecto-patentia, stricta, carinato- 

 concava, e basi oblonga sensim et longe subulata, pilifera, marginibus erectis, 

 integerrimis, nervo c. 0,06 mm lato, basi angustiore, in pilum strictiusculum, 

 serrulatum, plus minusve elongatum producto, cellulis laminalibus incrassatis, 

 lumine sinuosulo, superne subquadrato, dein ovali vel oblongo, basilaribus 

 rectangularibus, baud incrassatis, h^-alinis, marginalibus tenerioribus et angustio- 

 ribus; seta 2 mm vel paulum ultra alta, cygnea, lutea; theca minuta, oblonga, 

 leptodermis, pallida, laevis; annulus angustus, per partes secedens; exostomii 

 dentes dolabriformes, aurantiaci, minutissime papillosi, superne irregulaiiter 

 perforati vel bifidi; spori 0,007 — 0,010 mm, fuscolutei, laeves; operculum minu- 

 tum convexo-conicum ; calyptra cucullato-mitraeformis, trilobata. (Taf. XIII, 

 Fig. 17.) 



Vulkan - Gebiet: Karisimbi, Gipfelkegel, ca. 4000 m ii. M. (reichlich 

 fruchtend im Sept. 1907 — n. 2085). 



Species pulcherrima, Gr. incurvae Schwaegr. valde affinis, sed rete cellulari 

 foliorum et calyptra cucullato-mitraeformi ut videtur diversa. 



Grimmia abyssinica Bruch et Schimp. — Gr. Kamerun-Berg: Lavastrome 

 unter der Herzogin Elisabeth-Hiitte am Fako-Gipfel ca. 3800 m ii. ]\I. (steril im 

 Juni 1908 — n. 3385/86). 



Bisher bekannt vom Kamerun-Berg, Abyssinien und vom Kilimandscharo. 



Rhacomitrium durum (C. Miill.) Par. — Vulkan -Gebiet: Ninagongo, obere 

 Ericaceen-'R.Qgion, ca. 3200 m. ii. M. (steril im Sept. 1907 — n. 2003); Karisimbi, 

 Gipfelkegel, ca. 4000 m ii. M. (steril im Sept. 1907 — n. 2084). 



Bisher bekannt vom Kamerun-Berg und vom Ruwenzori. 



Orthotrichaceae. 



Zygodon argutidens Broth, n. spec. — Dioicus; robustiusculus, caespitosus, 

 caespitibus densis, mollibus, lutescenti-viridibus ; caulis usque ad 2,5 cm altus, 

 erectus, dense fusco-tomentosus, densiuscule foliosus, dichotome ramosus, ramis 

 fastigiatis; folia sicca flexuosula, humida e basi erectiore horride patula, carinato- 

 concava, lineari-lanceolata, breviter acuminata, mucronata, marginibus erectis, 

 summo apice dentibus nonnullis inaequalibus, angustis, acutissimis, partim sub- 

 ciliiformibus praeditis, nervo lutescente, breviter excedente, dorso laevi, cellulis 

 hexagono-rodundatis, dense papillosis, obscuris, basilaribus anguste oblongis, 

 lutescentibus, laevissimis; seta 10 — 15 mm alta, pseudolateralis, tenuis, flava; 

 theca erecta, longicollis, subcylindraceo-elliptica, microstoma, sulcata, pallida, 

 evacuata angusta, fusca; annulus persistens; peristomium simplex, internum; 



