1925] Setchell-Gardner : Melanophyceae 553 



containing the endochrome ; reproduction by phirilociilar gametangia 

 surrounding depressions containing tufts of extruding hairs, and, by 

 extension at times, nearly covering the fronds. 



J. G. Agardh, Nya Alg., 1847, p. 7. 



The type species of the genus is C. pacifica from St. Augustin, 

 Mexico, listed later by J. G. Agardh as C. fastigiata var. pacifica. 

 Chnoospora is the only genus we feel inclined to refer to the family 

 Chnoosporaceae, for the reasons given above in discussing the family. 



Chnoospora pacifica J. Ag. 



Fronds densely caespitose, many arising from a solid disk-shaped 

 holdfast, of the same diameter throughout except at the slightly atten- 

 uated apices, 2.5-7.5 cm. high, 2 mm. wide, 1 mm. thick ; branches 

 forming acute angles. 



J. G. Agardh, Nya Alg., 1847, p. 7 ; Setchell and Gardner, Mar. 

 Alg. Gulf Calif., 1924, p. 728. Chnoospora fastigiata var. pacifica 

 J. G. Agardh, Sp. Alg., 1848, pp. 171, 172. Barton, On the fruit of 

 Chnoospora fastigiata, 1898a;, p. 507. Sargassum piluliferuni Collins, 

 Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 537&. 



The material upon which this species, as well as the genus, was 

 founded was collected by Professor F. M. Liebmann at St. Augustin, 

 in the southern portion of the state of Oaxaca, on the Pacific coast of 

 Mexico. This is a tropical locality and the Chnoospora was accom- 

 panied by several other marine algae described also in the same paper. 

 J. G. Agardh also described a species of Chnoospora, at the same time, 

 from La Guayra on the Caribbean Sea which he named C. atlantica. 

 In 1848, he united these two species as varieties under a new name, 

 C. fastigiata. The name C. pacifica has the rights of priority and we 

 have retained it. It seems widespread in the Pacific and Indian oceans, 

 although possibly appearing in a number of forms. It seems likely 

 that C. pannosa J. G. Agardh, from Hawaii, is simply a pannose 

 growth form of C. pacifica. C. atlantica J. Ag. from the Caribbean has 

 the fronds dilated under the axils and may be a distinct species. 

 C. implexa Hering is doubtful and may very possibly prove to be of 

 quite a different genus, but there are forms of our own coast species 

 approaching it in habit. 



