1626 Eu-Florideae, Dumontiacese, Dudresnaya. 



sunt in Dndresnaya coccinea sat elongata et ob articulos medios 

 incrassatos anibitu fere fusiforuiia, in Dudresnaya purpurifera 

 sunt breviora, magis clavata, articulo superiore, ut videtur, pr;e- 

 cociore; in nucleis maturescentibus hujus articulos inferiores quo- 

 que transmutatos complecti putavit J. Agardh, ([ui ba^c observa- 

 tiones exbibuit. Tetrasporangia in filis peripbericis ex articulo ter- 

 minali incrassato et transmutato formata, oblongo-sphicroidea, nu- 

 cleo intra perisporium zonatim quadripartita. 



1. Dudresnaya coccinea (Ag.) Crouan in Ann. Sc. Nat. 1835, t. II, -"^ 

 f. 3-4, Cbauvin Recbercbes p. 50, J. Ag. Sp. II, p. 108, Epicr. 



p. 249, Florid. Morpbol. t. 16, f. 1-10, Born. et Tbur. Not. algol. 

 p. 35, t. XI, Ardiss. Pbyc. Medit. I, p. 189, Buffbam On Antbe- 

 ridia of Floridea? (1888) pag. 259, Hauck Meeresalgen pag. 100, 

 fig. 36, Heydr. Tetr. Florid. (1902), p. 6, t. I, f. 16-17, Mesogloia 

 coccinea Ag. Syst. p. 51, Ulva coccinea Poir. [?] sec. C. Ag., Nema- 

 lion coccineum Kuetz. Sp. p. 713, Tab. Phyc. XVI, t. 64, f. a-d, 

 Rivularia verticillata Engl. Bot. tab. 2466, Callithainnion verti- 

 cillatum Kuetz. Pbyc. p. 373, Dadresnaya formosa Bonnem. (fide 

 J. Ag. ), Batrachosperma rividarioides Bory (sec. Duby), Du- 

 dresnaya ve^^ticillata (Witber.) Le Jol. Alg. Mar. Cberb. p. 117. 

 — Fronde pyramidata, dense ramosa, filis periphericis inferne op- 

 posite ramosis, superne dicbotomis, articulis cylindraceis diametro 

 3-4-plo longioribus. 



Hah. in oceano Atlantico ad oras raeridionales Angliae (Har- 

 vey) et Gallite (Crouan, Le Jolis etc.) usque ad Tingin Africae 

 (Schousboe); in mari xAdriatico ad Venetias (Zanardini) et oras 

 IstriiB (LiECHTENSTEiN, IIauck) ; iu mari Tyrrbeno ad Neapolin 

 (Falkenberg) ; in mari Ligustico ad « Porto Maurizio » (Str,\ffo- 

 RELLo); in Mediterraneo occidentali ad insulas Balearicas (Rodri- 

 guez). — Frons 5-20 cm. longa, crassitiem pennce corvin* jequans, 

 dense ramosa, ramis plerumque satis distantibus conformibus, saepe 

 ambitu pyramidata. Articuli tubi axilis cylindracei, diametro 3-4- 

 plo longiores. Fila peripberica inferne ramis patentioribus oppo- 

 sitis, superne erectiusculis dichotomis divisa, ad genicula vix con- 

 tracta; articuli cylindracei tenues, diametro 3-1-pIo longiores. Cy- 

 stocarpia ac tetrasporangia generis. Antberidia iis Helminthorar 

 divaricato2 similia, parum perspicua. Color coccineus. Specimina ex- 

 siccatione ciiarta^ arctissime adbnerent. 



2. Dudresnaya purpurifera J. Ag. Alg. Med. p. 85, Sp. II, pag. 108, 2561 



