46 P. DUSEN, MOSSES FROM THE WEST COAST OF AFKICA. 



A smaller, finer, more gracile and more densely branched species than P. punctulatum, 

 with smaller and less patent leaves and branchlets, less serrate leaves and not papillous cells. 

 Rather dark-green than light. Laxly cespitose in very expanded tufts. 



32 32 ,. 32 . 142 



Fig. a folia ramea inferiora — ; b folia ramea — ; c foliuin raiuulinura — ; d cellulce apicales — — ; 



e cellulae basales — — . 



Pl. V. fig. 2 planta raagn. uat. 



Porotrichum lepto-meteorium C. Muller n. sp. in litt. 



Dioicum, intricate csespitosum, pendulum, liaccidissimum, sordide viride, apicem 

 versus pallide viride; caulis repens, sat remote ramosus; rami primarii stricti, usque ad 

 25 cm. longi, mox defbliati, capillares, basim versus densiuscule irregulariterque bipinnati 

 vel tripinnati, apicem versus remote pinnatim ramulosi, secundarii plurimi breves, paten- 

 tissimi, simplices, complanati, haucl vel leniter attenuati, interdum in flagellum producti, 

 nonnulli praecipue basim ramorum versus longi, penduli, irregulariter bipinnatim ramulosi; 

 folia disticha, ovato-oblonga, acuminata, caviuscula, marginibus inferne plus minusve re- 

 flexis, ceterum planis, superne min ute serratis, medio minutissime serrulatis, inferne in- 

 tegris, nervö stricto, longe supra medium folium abrupto, dorso aculeo brevi coronato, 

 cellulis elongatis, chlorophyllosis, laevissimis; cetera ignota. 



Habitat in Camerunia in truncis ramnlisque arborum, nbi prope Basse pagum m. Octobri 

 a. 1<S90 et prope Etome pagum m. Januario a. 1892 legi. 



Pl. VI. fig. 1 planta magn. uat. 



Thamnium leptopteris n. sp. 



Syn. Thamnium leptopteris C. Muller in litt. 

 » pro/usum C. Muller in litt. 



Dioicum, laxe csespitosum, viride, nitidiusculum, rigidum; caulis repens, remote 

 ramosus; rami erecti, usque ad 10 cm. alti, stricti, complanati, superne plus minusve ar- 

 cuati, inferne simplices, superne pinnati vel interdum bipinnati, plerumque pulchre den- 

 droidei, ramulis sat elongatis, complanatis, leniter attenuatis, haud in flagellum productis; 

 folia inferiora parva, squamaeforrnia, squarrosa, e basi lata subito attenuata, triangulseformia, 

 acuta, marginibus e basi ad medium vel altius paullum reflexis, integerrimis vel superne 

 minutissime et parce serrulatis, nervö supra medium folium producto vel breviore, interdum 

 indistincto, cellulis elongatis, super iora sensim majora, disticha, patula, subiinbricata, asym- 

 metrica, oblonga vel late ovato-oblonga, apiculata, caviuscula, marginibus uno latere reflexis, 

 ceterum planis, superne grosse serratis, medio serratis, inferne integris vel minutissime serru- 

 latis, nervö crasso, longe supra medium folium abrupto, dorso aculeo brevi coronato, cellulis 



