1919] Setchell-Gardner : Myxophyceae 15 



7. Chlorogioea AVillc 



Cells spherical or oval, with firm, structureless, gelatinous tegu- 

 ment; by division in three planes building up irregular colonies of 

 indefinite size, with cells arranged in more or less distinct vertical or 

 radial rows ; reproduction by cell division ; new colonies produced by 

 disintegration and separation of the cells of the old colonies. 



Wille, Algol. Not. I-VI, 1900, p. 5. 



The genus Chlorogioea was founded by Wille to include two 

 plants which he considered as most probably identical. The one is 

 Palmella{f) tuhcrculosa Hansgirg (1892, p. 240), an epiphyte on 

 various filamentous marine algae in the neighborhood of Ragusa in 

 Dalmatia in the upper portion of the Adriatic Sea. The other, and 

 the plant studied by Wille, was found at Mandel and at Drobak on 

 the south coast of Norway. These specimens were found on Laminaria 

 digitata, Rhodochorton Rothii and even on the exoskelctons of Brj^ozoa. 

 The Norway specimens were considered by Wille as specifically and 

 generically identical with those of Hansgirg. Wille 's description was 

 drawn chiefly from the plants on Rhodochorton found at Drobak. The 

 position of the genus seems clearly to be with the Chroococcaceae, since 

 no gonidangia with gonidia have been detected. 



The genus Chlorogioea consists, at present, of four described 

 species, C. tultemilosa (Ilansg.) Wille (type), from the northern 

 Adriatic Sea, south Norway, and Peru, C. endophytica M. A. Howe 

 from Peru, and the two species described recently from the Pacific 

 Coast of North America. Chlorogioea resembles Oncohyrsa, but is 

 characterized by very much smaller cells without distinct special tegu- 

 ments and forming less distinctly spherical or lobed colonies. It also 

 approaches some species seemingly more properly referred to Hyella, 

 from which it differs vegetatively in not having its cells arranged in 

 definite filaments of two sorts as is the case in Hyella. Chlorogioea 

 also differs, so far as known, in not producing gonidangia and gonidia 

 as is the case in Hyella. In the absence of gonidia it is difficult in 

 some cases, at least, to determine with satisfaction to which genus a 

 certain plant may best be referred. The experience of Howe and of 

 Gardner points towards the existence of a number of these obscure 

 epiphytes and endophytes on red algae, bryozoa, etc., which need 

 careful search and study before they can be added to the flora and 

 the complexity' of their relationships unravelled. 



Wille {loc. dt.) has stated that cell division takes place only in 

 one plane. This does not seem to be the case in the species studied by 



