CH.ETOPHORACEJL. 197 



Coleochaete oxbiculaxis. Prings. Jakrl>. t. 1, /. 5. 



Disc orbicular, parencliymatous, 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. 



Babh. Alg. Ear. iii., 390. Kirch. Alg. Schles. p. 50. 



Phyllactidium pulchellum, Kutz. Tab. Phyc. iv. 



On aquatic plants. 



Plate LXXX. fig. I. a, plant X 200. b, portion with oogonia, after 

 Pringsheim X 250. 



GENUS 75. APKANOCHJETE. 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. 



Aphanochaete jrepens. 



Filaments and branches procumbent, fn rhtly 



swollen, of equal diameter in both 

 indistinctly articulated bristle. 



SIZE. Cells -005 --01 mm. 



Rabh. Alg. Eur. iii., 391. Kirch. Alg. Schles. p. 71. 



On Cladophora jlavescens, and other Alga?. 

 Plate LXXX. fig. 3. Plant of Aphanochtfte repens X 400. 



Aphanochaete hystsrix. (Thiu.) Baoli. Alg. Eur. in. 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. 



Ochlochcste 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, 

 a marine species. 



Plate LXXX. fg. 2. a, plant of Aphcmochci-te hysiria\ slightly 

 magnified, b, portion more highly magnified, after Harvey. 



