1542 Eu-Florideae, GrateloupiaceHe, Halymenia. 



substantia CJirys>jmenia3 ventricosce. Tetrasporangia cruciatim di- 

 visa, inter cellulas verticales elongato-oblongas strati superficialis 

 sparsa. Cellula? intermediie rotundatae, laxiores et anastomosantes, 

 pluribus stratis dispositae; centralia fila generis, laxa et anasto- 

 mosantia. Specimina exsiccatione chart;e arctissime adh;erent. Si 

 revera a specie Agardhiana distincta sit Dumontia cystophora 

 Mont., nullo mihi cognito Montagneana? plant» (prioritatem gau- 

 dentis) specimine, dijudicare non audeo; suam speciem in mari Me- 

 diterraneo a DeHIe professori monspeliensi lectam expressis verbis 

 dixit clarus Montagne. Cystocarpia descripsit glomerulos sphsericos 

 in strato peripherico hinc inde sparsos sistentia, sporis angulatis, 

 roseis, minimis. 



Sectio III. IsYMENiA J. Ag. Aual. algol. (1892) p. 56 partim, Anal. algol. cont. V 

 (1899) p. 60 [ut gen.]: Species fronde gelatinosa aut submembranacea, e te- 

 reti compressa aut rite complanata aut plus minus trigona, varie ramosa sae- 

 pius di-trichotoma fastigiata, filis tenuissimis cylindraceis articulatis laxius 

 invicem anastomosantibus, intimis fasciculum tenuem secus longitudinem 

 froudis expansum formantibus, extrorsum sensim in fila consimilia abeuntem, 

 interiora adliuc laxius anastomosantia, extima in stratum corticale adparen- 

 ter proprium cellulis minutissimis et invicem adproximatis globosis aut ob- 

 ovatis constitutum plus minus gelatinosum conjuncta. 



1. Frondis celluli» exteriores minus gelatinosse, hinc in membranam quasi pro- 

 priam tenuissimam conjunctaa, frondem magis planam constituentes. 



7. Halymenia Agardhii n. nom., Isymenia flabellata J. Ag. Anal. algol. 2401 

 cont, Y (1899) p. 66 (absque diagnosi) (non Halymenia fidbellata 

 Schmitz 1895), Chrysymenia dichotomo-flabellata Crouan in Maze 

 & Schramm Flore Guadel. p. 163?. — Fronde eximie flabellata, su- 

 pra stipitem angustiorem e cylindraceo compressum expansa, seg- 

 mentis plus minus numerosis, ima basi cuneato-dilatatis, dein li- 

 nearibus, terminalilnis conformibus apice obtuso terminatis, nunc 

 ima sua basi quasi strictura separatis. 



Hab. in oceaiio Atlantico ad oras India^ occidentalis (Maze). — 

 Frons 12-20 cm. longa, stipite crasso, ramis seu segmentis infra 

 dichotomias 10-12 mm. latis. Structura qualis in sectione Isyme- 

 nia3 indicatur. Tetrasporangia intracorticalia, cellulis sterilibus 

 conspicue majora, sparsa, cruciatim divisa, Substantia potius mem- 

 branacea quam gelatinosa. 



