Eu-Floridese, Dumontiacese, Dumontia. 1621 



DUMONTIA l.ainour. |18ia| Essai 45 p[». (Etym. a Dijmont (VIJr- 

 viLr.K, iiavigatore (•clobcrriiiio), (irev. Alg. Brit. p. Hil, Kuetz. J. 

 Ag. Sp. II, p. 319, h^picr. pag. 2r)(), Phyc. gener. t. 71, II, Spe- 

 cies pag. 718 (excl. sp. fere oithi.). Kupr. Tange des Ocht. Meiu'. 

 p. 312 (ubi de synonyinia Duinontiarum accurate disseriturj, Engl. 

 & Praiitl Natiirl. PMaiizenfaiu. (1897) pag. B17, Gastridii, Ulvoe, 

 Conferva3, Ilalymetmu, Chonclria^, Fttci sp. auct. — l<'rons cy- 

 lindracea aut subcompressa, continua, tubulosa, vage raiiiosa, filis 

 articulatis tota constituta, interioribus longitudiiialibus laxissimis 

 anastomosantibus, peripheriam versus magis adproximatis in fila 

 verticalia moniliformia, dichotomo-fastigiata, stratum corticale for- 

 mantia abeuntibus. Cystocarpia minutissima, plurima, frondi im- 

 mersa, solutione partis deinum liberata, nucleo simpliri constituta; 

 nucleus a fascicnlo filorum moniliformium, articulos brevissimos 

 gerentium transformatus, carposporis majusculis oblongis, mutua 

 pressione subangulatis, a filo placentari radiantibus, muco cohi- 

 bitis constans. Tetrasporangia strato peripherico immersa, sparsa, 

 rotundata, cruciatim divisa. 



Obs. De genere sequentes observationes congessit clarus .1. 

 Agardh. Frondes a disco radicali erectiusculte, cylindrace^e, tubu- 

 losae, lateraliter ramosa^, ramis elongatis simpliciusculis frondi 

 conformibus. Fila longitudinalia frondis tubum percurrunt in me- 

 dio laxissima, peripheriam versus densiora, attamen laxa, elongata, 

 anastomosibus juncta, endochromate articulato. Stratum periphe- 

 ricum filis verticalibus dichotomo-fastigiatis, moniliformiter-arti- 

 culatis, muco solidescente cohibitis constat. Inter ha^c fila iisque 

 cincta cystocarpia suspensa sunt; a ramo nempe centrali filorum 

 peripheri;« transformata videntur, ramis lateralibus sterilibus am- 

 bientibus. Fila carposporifera brevia aut intra cellulam diametro 

 longiorem subdivisione longitudinali aut intra cellulam diainetro 

 breviorem transversali subdivisione orta, brevissime articulata mo- 

 niliformia, iterata subdivisione in nucleum minorem transformata. 

 Carposporee oblongte, singul;e sacculo suo proprio inclus;e adpa- 

 rent, sed omnes conglobatse et muco cohibit:i3. Tetrasporangia ex 

 articulis infraperiphericis strati corticalis formantur; sunt magna, 

 rotundata et cruciatim divisa. 



1. Dumontia filiformis (Fl. Dan.) Grev. Alg. Brit. p. 165, tab. XVII, 2555 

 Harv. Phyc. Br. tab. LIX, Kuetz. Sp. pag. 718, Tab. Phyc. XVI, 

 f. 81, Ruprecht Tange des Ochot. Meer. pag. 298-299 (Damontia 



