756 Eu-Florideze, Bonnemaisoniaces, Leptophyllis. 
Conspectus generum 
I. Frons plana aut ancipiti-compressa, inferne plerumque costam medianam 
leniter evolutam praebens. 
A. Cellula apiealis;transverse articulata. 
Leptophjyllis J. Ag. — Frons pinnatim ramosa, margine fere indistincte mi- 
nutissime serrata. Tetrasporangia irregulariter h. e. oblique eruciatim 
divisa. 
B. Cellula apicalis distiche alternans oblique articulata. 
Ptilonia J. Ag. — Frons ancipiti-compressa, deorsum inconspicue medioco- 
stata, margine plus minus regulariter serrato-dentata. Tetrasporangia 
ignota. 
Delisea Lamour. — Frons e tereti ancipiti-compressa, subinde deorsum me- 
diocostata, alterne serrato-pectinata. Tetrasporangia zonatim divisa. 
Bonnemaisonia Ag. — Frons filiformis, opposite ciliato-plumosa, tubulosa. 
Tetrasporangia ignota. 
II. Frons filiformis aut tantum paulisper compressa. 
Asparagopsis Mont. — Frons lateraliter ramosissima, superne penieillato- 
ramosa. Tetrasporangia ignota. 
III. Frons (parasitica) inferne teres et compacta, superne tubuloso-cava, quasi 
subglohboso-inflata. 
Ricardia D. et S. — Tetrasporangia triangule divisa. 
LEPTOPHYLLIS J. Ae. [1876] Epicr. p. 674 (Etym. /eptos angustus 
et phyllon folium), Schm. et Hauptfl. in Engl. & Prantl Natürl. 
Pflanzenfam. p. 418, Cladhuymenzce, Fwci, Delesserie, Acropeltidis, 
Dictymenic sp. auct. — Frons plana, linearis, subcostata, pinnatim 
decomposita, stratis fere tribus contexta, costa percursa tubo cen- 
trali solitario longius articulato, cincto cellulis strati intermedii ro- 
tundato-angulatis, strato corticali cellulis conformibus frondis super- 
ficiem areolatam efficientibus, inferne supra eostam magis evolutis. 
Cystocarpia in pagina pinnule elevata, adparenter terminalia, in- 
tra pericarpium subovatum, carpostomio pertusum, nucleum gene- 
rantia; fila carposporifera plurima fasciculatim a placentà basali 
elevatà radiantia, in articulis terminalibus carposporas magnas 
clavato-piriformes, invicem liberas foventia. Sori secus margines 
frondis in utraque pagina elevati, lineares, cellulis corticalibus in 
fila brevia verticalia mutatis tetrasporangiisque sine ordine dispo- 
sitis plurimis, demum rotundatis, cruciatim divisis constituti. 
Obs. De suo genere sequentia docet illustris J. Agardh. Frons 
omnino plana, in superiore parte secus costam vix elevata, mem- 
branacea et adspectum JDelesseric fere offerens, precipue plan- 
ta sorifera examinata, habitu et soris intra marginalibus adspe- 
