420 Eu-Floridea, Melanthalieze, Melanthalia. 
Hab. ad oras Peruvie (Havw). — Frons 10-15 em. longa, cras- 
sitiem penne meruline metiens. An revera hujus generis? 
7. Trematocarpus elongatus Kuetz. Tab. Phyc. vol. XVIII, tab. 4, 
f. d-g. — Fronde complanato-filiformi, stipite elongato tereti in 
frondem irregulariter dichotomam  subfastigiatam abeunte; cysto- 
carplis globosis. 
Hab. in oceano Pacifico (KuETZING). — Spitham:eus. 
Species a genere exeludenda. 
8. Trematocarpus furcellatus (Mont ) Kuetz. Tab. Phyc. XIX, t. 73, 
f. 2, est Sarconema fwrcellatum Zanard. Cfr. in hoc Sylloges vo- 
lumine pag. 967, n. 696. 
MELANTHALIA Mont. [1843] in Ann. Se Nat. 1843, Cent. IV, p. 33 
(Etym. melas niger et £halos ramus', Kuetz. Sp. Alg. pag. 784, 
J. Ag. Sp. II, p. 611, Epier. p. 403, Acropeltis sp. J. Ag. Advers. 
p. 50 et Alg. Liebm. p. 15, J/hodomele et Spharococci sp. Ag. 
et auct. — Frons anceps, coriacea, decomposito-dichotoma flabel- 
lato-fastigiata, segmentis angustis linearibus, subtripliei strato con- 
texta: interiore cellulis elongatis angulatis; intermedio brevioribus 
flexuosis; superficiali cellulis minutis subcubicis verticaliter dense 
seriatis constante. Cystocarpia submarginalia, hemisph:erica, intra 
pericarpium cellulosum erassum, cellulis verticaliter seriatis, inti- 
mis concentricis contextum, demum carpostomio apertum, nucleum 
simplicem foventia; placenta basalis, elevata, cellulosa, a vertice et 
lateribus fila carposporifera radiantia articulata, inferne cylindracea 
densissime constipata, superne moniliformia invicem libera emit- 
tens; carpospore in articulis moniliformibus superioribus plur: si- 
mul maturescentes, oblongo-rotundatse. Tetrasporangia in apicibus 
ramorum nematheciose incrassatis subclavzeformibus evoluta, ex ar- 
ticulis supremis filorum orta, cruciatim (?) divisa. 
Obs. Sequentia docet illustris J. Aceardh in op. cit.: Frondes 
inferne teretiusculze, superne complanate ancipites, dichotomo-ra- 
mosissim:z, segmentis anguste linearibus flabellato-fastigiatis, hic 
illie constrictz:e et a strictura prolificantes, frondem abruptam con- 
tinuantes. Apices truncati et quasi molliori jugo utrinque elevato 
terminati. Color frondis exsiccat:e nigrescens vel infra apices livido- 
fuscescens. Substantia firma, coriacea potius quam cartilaginea. 
Quoad structuram triplex fere stratum frons dissecta offert. Cellule 
axin constituentes sunt elongatz, hexagono-prismatic:ze et, subconti- 
Til 
