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, \vhorls 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 Lainouroux, 1816, p. 293; Harvey, 1858, p. 36, 

 PI. XLI.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; visually 1-3 mm. 

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

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

 Fig. 146. Fla., W. I. 



C.' rosarium L,amouroux and C. mcxicana 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 ramulus and surrounded by its branches, 

 producing biciliate gametes, by whose union is formed a 

 zygote, germinating immediately. 



D. CLAVAEFORMIS (Roth ) Agardh, 1828, p. 16 ; Kvitzing, 

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

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

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



Mediterranean . 



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 ovit a brownish- 

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



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



Vegetative frond as in Dasycladits ; sporangia chiefly lateral 

 on the ramuli and their branches, producing aplanospores. 



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

 1490; Bolryophora Conqucrantii Cramer, 1890, p. 6, PI. IV, fig. 

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



