1240 Rhodomelej:. Didyurus. 



subregulariter sejuncti, in parte suprema subconfluentes. Fila ramel- 

 lorum fasciculato-ramosissima callithamnioidea. Fructificatio deest. 

 Chartse adhseret." 



Harvey, qui plantum Sonderi in Fl. Tasm. p. 304 memoravit, ean- 

 dem vero non vidit, queerit an esset Crouania insignis Harvey. 



(Asperocaulon collabens Rudolph. in Linnefea 1831. an hoc loco uo- 

 minanda?J 



Species exclusce. 

 Dasya spongiosa Aff. = Eupogonium spongiosum Kiitz. = Cal- 

 lithamnion arbuscula. 



Dasya tenella Hering = Polysiphonia Heringii Harv. 



Dasya pallida Sond. = Eupogonium pallidum Kiitz. = Wran- 

 gelioe sp. sec. Harvey. 



EupoGONiuM SQUARROSUM Kut^. = sp. Callithamnii lide sp. in 

 Hb. Lenorm. 



dj. DlCTYURUS Bory ap. BeJanger Voy. Ind. Orient. p. 170. 

 J. Ag. in lAnncea XV.p.2i. Endl. Gen. Pl. Sttppl.III.p.^O. 

 Calidictyon Grev. inscr. in Wight et Arn. Prodr. Ff.penins. 

 Ind. Orient. et Lindlcy Nat. Syst. of Bot. Ed. II. p. 452. 

 Thuretia Becsne in Ann. Sc. Nat. Ser. III. Tom. II. p. 236. 

 Voy. de la Venus Pl. 2. A. Dictyurus et Thuretia Kutz. 

 Sp. p. 673. ct Auct. 



Frons teretiuscula aut plana, subpinnatim ramosa, ramis reticulo 

 tilorum areolas pertusas rotundato-hexagonas ambientium ve- 

 latis; velo ramulis a rachide egredientibus, anastomosi in- 

 vicem junctis, articulatis, monosiphoneis aut principalibus 

 sensim polysiphoneis venas constituentibus, formato. Kera- 

 midia a ramulo transformata subspha^rica intra pericarpium 

 cellulosum, carpostomio in mucronem producto apertum, 

 gemmidia obovata in articulo terminali filorum a placenta 

 centrali radiantium foventia. Spharosporcc in stichidiis a 

 ramellorum basi incrassata polysiphonia transformatis, utrin- 

 que adnatis conicis, circumcirca evolutse, zonis transversa- 

 libus superpositis pluriseriatas, triangule divisee. 

 Frondes nunc teretiusculse parce ramosse aut decomposito- 



pinnata?, nunc in laminas sursum concavas et marginibus ad- 



