48 



P. DUSEN, MOSSES FROM THE WEST COAST OF AFRICA. 



Very common, especially from a height of abont 600 m. up to nearly 2,000 m. Usually barren; 

 found with fruit only near the forest-line. 



„. , ,. 18 18 18 200 

 lM°\ « iolium raraeura - — ; b tulium raiminnuin — ; c tolia ramea mieriora -— : <l cellulse apicaies : 



„ , ' , ' 200 , . . . 18 , . ... 18 1 ,18 



e cellulse basales ; / penchsetmm — ; g bractese penchaetii — ; h capsula — . 



Pl. I. fig. 8. a pars exostoinii; b pars dentis exostoraii a late re visa . 



Pl. VT. fig. .'» planta magn. nat. 



Var. rivularis C. Miller in litt. 



A forma typica ramis valde rigidis, teretibus vel subteretibus, haud dendroideis, 

 remotissime ramulosis, foliis inferioribus majoribus, densiusculis, laxe imbricatis, superi- 

 oribus densiusculis, ramulis tum brevibus complanatis, tum elongatis, attenuatis, subtere- 

 tibus, pauci-ramulosis haec varietas distincta differt. 



Habitat in Camernnia in saxis rivalibus, ubi prope Beam pagum c. 1,100 metra supra mare 

 m. Julio a. 1891 legi. 



Pl. VI. fig. 2 planta magn. nat. 



Thamnium planissimum C. Muller n. sp. in litt. 



Flavescens, nitidum, rigidum, laxe casspitosum ; caulis repens, remote ramosus; rami 

 usque ad 6 cm. alti, erecti, plus minusve arcuati, complanati, inferne simplices, circiter e 



medio vel paullum inferius irregulariter pinnati vel bipinnati, haud dendroidei, ramulis 

 longiusculis, complanatis, attenuatis, haud in flagellum productis; folia ramea inferiora 

 parva, densiuscula, sursuin subito accrescentia, triangularia — late ovata, acuminata, patula, 

 caviuscula, marginibus inferne paullum refiexis, superne minutissime serrulatis, nervö supra 

 medium folium evanido vel breviori, cellulis elongatis, superiora magna, disticha, imbricata, 



