50 



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



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



Dioicum, viridissimum, nitidiusculum, laxe sed intricate caespitosum; caulis repens, 

 remote ramosus; rami erecti, stricti, complanati, rigidi, flagelliforme valde elongati, usque 

 ad 18 cm. longi, interdum apicem versus et hie illic in axillis radiculosi, inferne plus 

 minusve longe simplices, deinde remote irregulariterque bipinnatim ramulosi, haud den- 

 droidei, ramulis complanatis, attenuatis, valde elongatis, tlagelliformibus et intricatis, aetate 

 hic illic defoliatis; folia ramea inferiora parva, sursum sensim majora, late triangularia — 

 oblonga, longi uscula, acuminata, patula, marginibus inferne reflexis, ceterum planis, integris 

 vel superne minutissime serrulatis, nervö plus minusve longe producto, superiora et ramu- 



lina magna, disticha, asymmetrica, ovato-oblonga, apiculata, caviuscula, marginibus planis, 

 superne grossiuscule serratis, medio serratis, inferne integris, nervö viridi, supra medium 

 folium evanido, cellulis elongatis, chlorophyllosis, lasvissimis; cetera ignota. 



Habitat in Oamerunia in saxis interdum inundatis, ubi prope Boman am paguin e. G70 metra 

 supra mare m. Julio a. 1892 legi. 



Fio-- a folium rameum iuferius ; b folium rameum - ; c folium ramulinum — . 



B l l j 



Pl. IV. lig. 4 planta magn. nat. 



Thamnium suspectum C. Muller n. sp. in litt, 



Dioicum, viridissimum, rigidum, nitidiusculum, laxe caespitosum; caulis repens, re- 

 mote ramosus; rami erecti, stricti vel leniter arcuati, usque ad 5 cm. alti, complanati, 

 inferne plus minusve longe simplices, deinde remote irregulariterque bipinnati, haud den- 

 droidei. ramulis patentibns vel patulis, attenuatis, plerumque flagelliforme elongatis; folia 

 ramea inferiora triangularia, acuta, sat magna, patula, marginibus planis vel plus minusve 

 inflexis, integris, nervö crasso plerumque ad medium folium vel altius producto, superiora 

 majora, vix asymmetrica, ovato-oblonga, caviuscula, marginibus planis, superne medioque 

 minutissime serratis, ceterum integris, nervö crasso, viridi, longe supra medium folium 



