CHAS TOPHORACER. 197 
Coleochete orbicularis. Prings. Jahrb. t. 1, f. 5. 
Disc orbicular, parenchymatous, formed from one stratum of 
cells, bright green, cells oblong-quadrangular when old, by 
pressure becoming often polygonal, usually twice as long as 
broad. Oogonia oval, peripherical, mostly naked. 
Size. Cells (012-017 mm. 
Rabh. Alg. Eur. iii, 890. Kirch. Alg. Schles. p. 50. 
Phyllactidium pulchellum, Kutz. Tab. Phye. iv. 
On aquatic plants. 
Plate LXXX. fig. 1. a, plant X 200. 8, portion with oogonia, after 
Pringsheim X 250. 
Genus 75. APHANOCHZTE. Braun. (1847.) 
Articulate threads prostrate, somewhat creeping, sometimes 
more or less united in an irregular stratum. Branches decum- 
bent or ascending, cells bearing on their apex or back, often a 
long bristle which has no sheath at the base. Propagation by 
zoogonidia. Oogonia at present unknown. 
Aphanochete repens. Braun Rejur. p. 184. 
Filaments and branches procumbent, adpressed ; cells slightly 
swollen, of equal diameter in both directions, supporting an 
indistinctly articulated bristle. 
Size. Cells -005--01 mm. 
Rabh. Alg. Eur. iii., 891. Kirch. Alg. Schles. p. 71. 
On Cladophora flavescens, and other Alge. 
Plate LXXX. fig. 3. Plant of Aphanochete repens x 400. 
Aphanochete hystrix. (Thw.) Rabh. Alg. Hur. 111. 391. 
Filaments and their branches radiating, procumbent, ad- 
pressed ; more or less connate, in a pale green irregular discoid 
thallus. Cells somewhat cylindrical, produced at the apex into 
a long bristle, which is not articulated. 
Size, Cells ‘01 mm. diam. 
Ochlochete hystrix, Thwaites in Harv. Phyc. Britt. t. 226. 
On aquatic plants in brackish ditches. 
Perhaps scarcely deserving a place here, as it is almost, if not quite, 
@ marine species. 
Plate LXXX. fig. 2. a, plant of Aphanochate hystrix, slightly 
magnified. 6, portion more highly magnified, after Harvey. 
. 
