'388 ALGvE GL040CLADEJE. [Draparnaldia. 



whorled ramuli, consist of a single tube. The articulation of the 

 former is also probably spurious and merely a darkening or 

 intumescence, caused by the egress of so many ramuli from 

 the same point. This structure brings it so near to Mesogloia, 

 that no essential difference remains, excepting in the disposition 

 of the radiating branchlets." Carm. MSS. 



1. B. vdgum, Ag. (cylindrical Batrachosper mum); frond sub- 

 dichotomous cylindrical equal, apices of the branches incrassat- 

 ed. — Ag. Syst. Alg. p. 52. Lyngb. Hydroph. Dan. t. 64. 



In alpine bogs and lakes, common. — Varying in colour from dull- 

 green to bright aeruginose or even blue. 



2. B. monilijorme, Ag. (moniliform Batrachospermum); irre- 

 gularly branched, branches moniliform, apices attenuated — Ag. 

 Syst. Alg. p. 53. — Conf. gelatinosa, Dillw. Conf. t. 32. E. Bot. 

 t. 689.-/3. deter sum^ Ag. — Conf. atra, Dillw. Conf. t.ll.E. Bot. 

 t. 690. 



In subalpine streamlets.— Scarcely differing from the former, except 

 by its rather more distant whorls. Colour varying from grayish-green 

 to black, occasionally changing to purple in drying. Capt. Carmichael 

 found an extraordinary plant at Appin, which he considered a distinct 

 species, and called B. prpliferum j but it is probably only a variety of 

 the present. He thus describes it : " Fronds solitary, or in small clus- 

 tery j — 2 inches long, irregularly branched; branches divaricate, curved 

 or flexuose, opaque and very dark-coloured, beset with short ramuli, 

 which issue out from the joints among the whorls of eccentric filaments, 

 and are themselves beset with whorls: colour gray." Carm. MSS. 



87. Draparnaldia. Bory. Draparnaldia. 



Frond diorganous ; main filaments gelatinous, hyaline, emit- 

 ting, at the joints, pencils of coloured ramuli — Named in hon- 

 ourof J. P. H. Draparnaud, a French Botanist and Algologist. — 

 This beautiful genus is closely related to Chcetophora, from 

 which it differs in the absence of a firm gelatine and confer void 

 habit. 



1. D. plumosa, Ag. (feathery Draparnaldia); pencils of 

 branches linear-lanceolate acute. — Ag. Syst. Alg. p. 58. — Conf. 

 lubrica, E. Bot. t. 2087. 



In streamlets and wells, frequent. 



2. D. glomerdta, Ag. (clustered Draparnaldia); pencils of 

 branches ovate obtuse patent. — Ag. Syst. Alg. p. 58. — Conf. 

 mutabilis, Dillw. Conf t. 12. E. Bot. t. 1746. 



In streamlets and wells, frequent.— It scarcely differs specifically from 

 the former. 



3. D. tenuis, Ag. (slender Draparnaldia); ramuli simple sub- 

 fasciculate, primary filament partially coloured. — Ag. Syst. 

 Alg. p. 57. — Conf. lubrica, Dillw. Conf. t. 57. — C. protensa, 

 Dillw. Conf t. 67, and C. exigua, t. D. (status junior). 



