Blackman and Tansley. 
9 * 
* * Phytlieliacecc . 
Plant body always floating freely, unicellular or a more or less 
definite ccenobium. Cells very minute, spherical or nearly so, 
sometimes with a mucilaginous envelope, the walls bearing 
radiating bristles several times as long as the diameter of the 
cell . Reproduction by simple division or by the division of 
the cell-contents into several zoospores or into aplanospores 
(“autospores”) which may acquire the characters of the adult 
cell before or after their escape. 
[We have ventured provisionally to give the above name to a well- 
characterised and apparently natural group of fresh-water plankton-algae, 
most of which have been recently brought to light, mainly by the 
researches of Chodat and Lemmermann. See especially Beitnige zur 
Kenntniss der Planktonalgen, Hedwigia, 1898.] 
Genera. 
26. Golenkinia. Chodat, 1894. 
Cells usually single, each with a single parietal 
chromatopliore containing one pyrenoid. Cell-wall 
surrounded by a layer of mucilage and bearing 
numerous radiating bristles. Repioduction by simple 
vegetative division, by quadri-flagellate zoospores or 
by fiutospores. 
27. Richteriella. Lemmermann, 1896. 
Cells of the Golenkinia- type, but always united in 
ccenobia of 16 or 64 cells (smaller numbers may occur 
by some of the cells failing to divide) Cell-wall not 
surrounded by mucilage. Bristles only on the sides 
of the cells facing outwards, thick at the base, 
tapering. Vegetative division alone observed. 
28. Franceia. Lemmermann, 1898. 
Cells oval, single or united in colonies. Cell containing 
2-3 parietal chromatophores and a single vacuole; 
wall surrounded with mucilage. Bristles long and of 
uniform thickness. Vegetative division longitudinal. 
29. Phythelios, Frenzel, 1891. 
Cells spherical, single, with radiating bristles of unifoim 
thickness, a single chromatophore and no pyrenoid. 
Reproduction unknown. 
[This genus was originally described by Frenzel as a Heliozoan. 
Bis species has not been seen again, but the genus has been adopted by 
several algologists as an alga, Frenzel’s pseudopodia being interpreted as 
bristles. Recently another species has been described.] 
30. Acanthosphaera , Lemmermann, 1899. 
Cells spherical, single, with a pyrenoid cell-wall very 
thin, usually without mulcilage, bearing numerous 
radiating bristles. Lower third of each bristle thick 
and refractive, upper two-thirds very delicate and 
hyaline. Reproduction unknown. 
