THE GREEN ALGAE OF NORTH AMERICA 383 



tufts of branched, pluricellular hairs ; at the uncalcified por- 

 tions, whorls of sterile, undivided branches ; in the calcified 

 portions, whorls of branches each with a terminal sporangium, 

 and branches enclosing and passing beyond it ; the swollen 

 ends forming the surface of the frond. Development of spores 

 unknown. 



C. BARBATA Lauiouroux, 1816, p. 293; Harvey, 1858, p. 36, 

 PI. Xlyl.A. ; P. B.-A., No. 28. Frond to 20 cm. long, varying 

 much in density of branching ; joints from depressed-spherical 

 to cylindrical and several diameters long; usually 1-3 mm. 

 diani. ; '10-30 whorls of branches in a joint, 20-30 branches in a 

 whorl ; sporangia globose or short-pyriform, 160-200 p. diam. 

 Fig. 146. Fla., W. I. 



C. rosarium L,amouroux and C. vicxicana J. G. Agardh repre- 

 sent extreme forms, the former with joints mostly globular, the 

 latter with joints mostly cylindrical. A single plant will often 

 have branches representing these extremes, which therefore 

 should not have even varietal rank. 



' 6. DASYCLADUS Agardh, 1827, p. 640. 

 Stem unbranched, cylindric-clavate, uncalcified, attached at 

 the base by a lobed expansion, and bearing in the upper part 

 whorls of about 12 ramuli each; ramuli repeatedly branching, 

 each branch a distinct cell ; gametangia spherical, terminal on 

 the first cell of a rarnulus and surrounded by its branches, 

 producing biciliate gametes, by whose union is formed a 

 zygote, germinating immediately. 



D. CLAVAEFORMis (Roth) Agardh, 1828, p. 16; Kiitxing, 

 1856, PI. XCI, fig. 2 ; P. B.-A., No. 170. Fronds gregarious, 

 2-4 cm. high, about 5 mm. diam. ; whorls of ramuli closely set ; 

 gametangia 400-550 /x diam. Fig. 142. Fla., W. I. 



Mediterranca n . 



With the exception of a short basal portion, the whole of the 

 axis is covered with whorls so closely set as to form an appar- 

 ently solid mass, the individual whorls being quite indistin- 

 guishable. In drying the plant usually gives out a brownish- 

 yellow fluid, staining the paper on which it is mounted. 

 7. BATOPHORA J. G. Agardh, 1854, p. 108. 



Vegetative frond as in Dasycladus ; sporangia chiefly lateral 

 on the ramuli and their branches, producing aplanospores. 



B. OERSTEDI J. G. Agardh, 1854, p. 108 ; P. B.-A., No. 

 1490; Botryophora Conqucrantii Cramer, 1890, p. 6, PL IV, fig. 

 i ; B. occidentalis P. B.-A., No. 667 ; Coccodadus occidentals var. 



