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YORKSHIRE NATURALISTS UNION. 



Only known elsewhere in the British Isles from Glen Tilt, 



Perthshire. 



Sub-Family CHi^TOPHORE^. 



Genus HERPOSTEIRON Niig., 1849. 



66. Herposteiron repens (A. Br.) Wittr. [Syn. Aph 



lano- 



clmte repens A. Br., 185 1, non Berth., 1878]. 



S.VV. — Frizinghall, on (Edogo?iium sp. and Cladophora flaves- 



cens. Bradford, in aquarium, on Leimia trlsuka and Elodea 

 canadensis. 



Mid W, — Hawksworth, on Cladophora, 

 N.E. — Pilmoor, near Thirsk. Terrington, 



Herposteiron Nag. is distinguished from Aphanochcete Berth, 

 by the structure of its bristles ; they are articular and strongly 

 remind one of the piliferous apices of the branches of Chmto- 

 phora. Those of Aphanochcete are quite simple and possess a 

 sheathing base, which is not septate. In both these genera the 

 chlorophyll masses are parietal. These plants are usually found 

 as epiphytes on larger alg^ {Cladophora, (Edogonium^ etc.) and 

 on Le?nna, Elodea^ Nitella, etc. 



Genus NORDSTEDTIA Borzi, 1892. 



67. Nordstedtia globosa (Nordst.) Borzi. \^^\'\. Herpo- 

 steiron glohosa Nordst. ; Aphanochcete globosa Wolle]. 

 Mid W. — Cocket Moss, near Giggleswick. 

 N.E. — Strensall Common. 

 S.E. — Skipwith Common. 



The cells of this plant are spherical and each bears on its 

 dorsal surface a very long seta, which is quite simple. The 

 chromatophores are central and more or less stellate, and the 

 plants are enveloped in mucus. 



Grnus CH/I^TOSPHERIDIUM Klebahn, 1892. 



68. Chaetospheridium minus Hansg., 1893, [Syn. 



Aphanochoite 



globosa 



var. mifior Hansg. ; Chceto- 



splieriditim Pringshcimii Klebahn, 1892]. 

 N.E. — Pilmoor, near Thirsk. . 



Trans. Y.N.U., 1896 (pub, Sept. igoo), Bot. Series, Vol. 5. 



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