93 
Classification of Green Algce. 
3T. Bohlinia. Lemmermann, 1899. 
Cells oval, single, with many radiating bristles which 
are thickened at their bases. Chromatophores 1-2, 
parietal, without pyrenoids. Reproduction by auto¬ 
spores, bristles developed while within the mother-cell. 
32. Lagerheiniia. Chodat, 1895. 
Cells single or in coenobia of 2-8, enclosed in the mother 
cell-wall, ellipsoidal or cylindrical with rounded ends. 
Chromatophore single with one pyrenoid. Cell-wall 
solid, bearing bristles. Bristles tapering, each with a 
basal wart. Reproduction by vegetative division, 
Li-flagellate zoospores (?) or autospores 
33. Chodatella. Lemmermann, 1898. 
Characters of Lagerheiniia, but bristles often numerous 
and with no basal warts. Reproduction by autospores. 
34. Schroederia. Lemmermann, 1898. 
Cells single fusiform, many times longer than broad, 
sometimes curved or spirally twisted, with a bristle at 
each end. Single chromatophore and pyrenoid. 
Reproduction by vegetative division observed. 
[This form much resembles a Raphidium with polar bristles.] 
35. Centratractus. Lemmermann, 1900. 
Cells sing’e, oval, bearing at each end a long hollow 
bristle thickened at the base. Several reticulate 
chromatophores with no pyrenoids. Reproduction by 
transverse division. 
The affinities of the following genera are doubtful:—- 
36. Pleurococcus. Menegliini, 1842. 
Cells spherical when isolated, typically with a single 
(sometimes parietal) chloroplast, with or without a 
pyrenoid. A transverse internal cell-wall is formed at 
vegetative division, and the daughter cells frequently 
remain together in groups of 2, 4 or more, the walls 
in contact being flattened by mutual pressure. Under 
certain conditions the cells of such groups may grow 
out to form short filaments. 
[Very great confusion has prevailed as to the identity and life-history 
of the forms included in this genus. According to Chodat some species 
are extremely polymorphic, reproducing themselves under different 
conditions by vegetative division, aplanospores, zoospores or gametes, 
and giving rise to cells closely resembling those belonging to other 
genera of unicellular algae. This is, however, denied by various other 
algologists.] 
37. Pilidiocjfstis. Boldin, 1897. 
Cells oval, endophytic in the mucilage of Cyanophyceous 
colonies. Cell-wall forming a thick cap towards the 
surface, but hardly traceable elsewhere. From the 
deeper end one or two threads project downwards, 
