Eu-Florideze, Rhodymenie:x, Gastroclonium. 965 
Hab. in mari Rubro ad «Suez, Akaba » (PoRTIER, ZANARDINI); 
in sinu « Assab » (MancACCI, CARAMAGNA, ORSINI, PrccoNE). — F rons 
ewspitosa, 4-5 em. longa (Zanardini habet 4-5 decim., verisimil- 
lime ex errore typographico), 2 millim. lata, parum supra basin 
ramosa, circumscriptione triangularis, plus minusve conspicue tri- 
pinnata, pinnis pinnulisque patentibus oppositis vel distiche alter- 
nantibus raro subvertiecillatis, ultimis magis irregulariter exeunti- 
bus, omnibus vero valde approximatis apice obtusis, basi vix at- 
tenuatis. Diaphragmata ob stratum corticale compactum fere incon- 
spicua. Color fusco-purpureus in viridem facile abiens. Sec. Pic- 
cone Manipolo Alg. mar Rosso 1889 p. 14 frons in aqua marina 
colorem vivide violaceum pr:ebet, mox, si alga ex aqua extrahitur, 
evanescentes. Substantia gelatinosa membranacea ita ut specimina 
exsiecatione chart:e adhzereant. 
GASTROCLONIUM Kuetz. [1843] Phyc. gen. p. 441, Sp. pag. 865 ex 
parte, Ardiss. [1885] Phye. Medit. I, p. 318, Ka/zformza, Stackh. 
Tentamen Nereis brit. (ed. II) p. 56, 78, Sedo?dea Stackh. l. c. 
p. 57, 89, Dasyphylla Stackh. Ner. brit. (ed. II) p. XL, Lomentari«, 
Chylocladiee, Chondrie, Gastridit, Conferve, Gigartine, Fuci sp. 
auct. — Frons teretiuscula, ramosa, tubulosa, diaphragmatibus cellu- 
losis s:epius intersepta, nunc inferne solidescens quasi caulescens, 
ramis tubulosis et constrictis, filis sparsissimis diaphragmata jun- 
gentibus, strato peripherico cellulis minutis rotundato-angulatis, 
interioribus majoribus contexto. Cystocarpia intra pericarpium ex- 
ternum subsphsriceum, limbo pellucido cinctum, clausum, nucleum 
telà arachnoideà cinctum subglobosum foventia. Carposporw pyri- 
formes in placenta a fundo ascendente quoquoversum radiantes. 
Tetrasporangia per ramulos sparsa aut densius acggregata, trian- 
eule divisa. Antheridia e cellulis minutissimis in soros superfi- 
ciales colleetis constituta. 
Obs. Genus sub nomine Gastrocloni a cl. Kuetzing jamdiu pro- 
positum species summopere diversas et Chrysymenic et Lomen- 
lari recentiorum amplectebatur. Ne vero in Lomentaria, qualis 
a Lyngbye (1819) definita fuit, Fwcwm kaliformem, cystocarpii 
strueturam omnino ab ea Lomentaric articulate (Huds.) Lyngb. 
ostendentem, includam, genus Gastroclonzwm, sensu Ardissoniano 
emendatum, libenter recipio, eidem et Fwewm kaliformernm et non- 
nullas alias species, consimilem pr:bentes fructus structuram ad- 
seribens, 
