116 



CEYLON MARINE BIOLOGICAL REPORTS. 



-CAULERPA LESSONII, Bory. 



BORY, Voyage de la " Coquille," Crypt, p. 193. 1828. Atlas, PI. 22, Fig. 3. 

 Kftzing, Tab. Phyc. vol. 7, tab. 6. 



Sys. Caulerpafissidentoides,GR^viLL-E, Remarks on some Algse bel. to the Genus Caulerpa. 

 Ann. and Magazine of Nat. Hist., vol. XII, sec. ser. (1853), p. 3, PI. II. 

 Caulerpa Lessonii, J. G. Agardh, Till Alg. Syst. I., p. 24 (1872). 

 Caulerpa pennata, J. G. Agardh, loc. cit. p. 26 (1872). Type-specimen in Herb. J. G. 

 in Lund. No. 16,624 (= Harvey, Friendly Isl. Alg. No. 68 ; note ! some specimens largely 

 intermixed with G. sertularioides [Gmelin] Howe !). 



Caulerpa Lessonii Weber v. Bosse, Monographic des'Caulerpes, p. 339 (1898). 

 Caulerpa plumuUfera, Weber v. Bosse, loc. cit. 

 Syn. ? Caulerpaamicorum, Harvey. Friendly Island Alg. Nos. 62, 63 (Herbarium J. G. Agardh 



in Lund. Nos. 16,630, 16,631). 

 Exsicc. Ferguson, Ceylon Algae No. 413 (Tuticorin, South India)! 



f. typica. The vertical axes more or less branched. The assimilators about 5 ram. in 

 breadth with predominantly two-sided (but sometimes at the base also three-sided) 

 pinnules, of ten larger than the main axis, which goes up to 2 mm. in breadth (fig. 11). 



f. tuticorinensis. The vertical axes repeatedly furcated with tlie basal parts cylindrical 

 for a good way up and without pinnules. The assimilators of three kinds : the 

 majoiity not above 2 mm. in breadth, flat, with two-sided pinnules of about the 

 length of half the main axis, othere flat, as before, of a breadth of up to 5 mm. with 

 two-sided pinnules somewhat bent upward, rather longer than the main axis, which is 

 2 mm. in breadth (that is, of the same kind as the /. typica), and finally too, though 

 rare, assimilators with cyUndrical main axis and only three-sided pinnules (fig. 12). 



Fig. 11. — C. Lessonii Boky / typica. (1 x 1). 

 The plant designated by me as the main form (fig. 11), was collected in the district by J. Hornell, 

 east of the East Cheval Paar in the Gulf of Mannar, at a depth of about 10 in. It is a sand Caulerpa 

 with the same mode of growth as C. Freycinetii with a very coarse horizontal stem, which often grows 

 very deep in the sand. 



