Blackman and Tansley. 
7 2 
indefinite shape, cells dividing in two or three directions in 
spaceunited by mucilage derived from the mother-walls. Zoospores 
described in some forms. 
Genera. 
§Co1ony indefinite. 
1. Gloeocystis. Nageli. 
Colonies indefinite, mucilage shewing concentric layering 
round the cells or cell groups. 
2. Palmella, Lyngbye. 
Colonies indefinite, mucilage not shewing concentric 
layering. 
3. Schizochlamys. A. Braun. 
Cells scattered without order in mucilage, groups of 2 
or 4 often remaining together. Cell-wall splits into 2 
or 4 equal parts at division. Zoospores recorded. 
^Colony definite. 
4. Palmodactylon. Nageli. 
Colonies finger-shaped, simple or branched, sometimes 
diverging from a common centre. Cells spherical. 
Zoospores described. 
5. Palmodictyon. Kiitzing. 
Colonies rounded, few-celled, connected into an anasto¬ 
mosing network. 
6. Pnlmophyllum. Kiitzing. 
Colonies flat, leaf-like, of considerable size, divided into 
fan-shaped lobes. 
(to be continued). 
It. Midley, Printer, Whitfield Street, W. 
