52 



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



subtuberculata, sicca sub ore constrieta; cellulis quadratis, collenchymatieis; p&ristomiwn 

 duplex; dentes exostomii 16, pallide fiavi, 0,382 mm. alti et 0,or>o mm. lati, hiimidi erecti 

 et e medio valde incurvi, sicci reflexi, medio intro genuflexi, ad lineam mediam parte 

 superiore dentium excepta profunde exarati, dense et alte trabeculati et lamellosi, dense 

 et pulchre transversaliter striati, summo papillosi; dentes endostomii pallidiores, 0,343 mm. 

 alti, humidi coimiventes, sicci erecti, valde carinati, linea media notati, minutissime granu- 

 losi; membrana basilaris carinata, 0,127 mm. älta; operculum conicum, siccitate scrobicu- 



r"\ 



/ 



latum, fusco-badium, rostro longo, stricto; calyptra mitradbrmis, albcscente viridis, hcvis, 

 margine longe timbriata. 



Habitat in Camerunia in trnncis putridis radicibusqne arborum, interdum in linmo, ubi 

 prope Etome pagum m. J annario a. 1892 c. fr., ad Bomanani pagum <J70 metra snpra mare m. 

 Decembri a. 1890 c fr., ad Kittam emporium m. Angusto a. 1890 legi. 



The inner peristomial teeth are strongly carinate, nearly conduplicate; I have not succeeded 

 in nnfolding them. Not rare, bnt never frerpient from tlie sea np to about 800 m. on the west 

 side of the Cameroons Mountain and probably still higher. Not foimd in the vicinity of Bea on 

 the sonth-west side of the same mountain; nearly always fertile. 



Fig. a folia lateralia — ; b folium antieum - 



45 32 



basales — ; / bracteae perichretii — . 



32 . 45 



c periehsetium — ; d cellulae medianse — ; e ceiinia 



I 



1 





