40 



YORKSHIRE NATURAJJSTS' UxMlON. 



Mid W.— Adel Bog (W. B. Turner). Ilkley (W. H. Dikes). 

 Cocket Moss, near Giggleswick. 



N.E. — Strensall (W. B. Turner). Pilmoor, near Thirsk. Carl- 

 ton Bank. Stokesley. 



152. Spirotenia bryophiJa (Breb.) Rabenh. 



[Syn. S. niusicola DeBai'y]. 

 Mid W. — Sliipley Glen (iv. 1895), forming a thin gelatinous 

 stratum amongst mosses on dripping rocks. 



153. Spirotaenia minuta Thur. 



N.E. — Pilmoor, near Thirsk, very abundant. 

 Var. eboracensis West & G. S. West. 



^ ■ 



Mid W. — Cam Tell, not uncommon along with Cyllndrocystis 

 crassa, Peniuvi digitus^ Ilyalotheca dissilieiis^ etc., in peat bogs. 



This variety is relatively shorter in proportion to its breadth 

 than the type; it has also blunter ends and more turns of the 

 spiral. Length, 30-32 /x; breadth, 7-8 /x. 



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154. Spirotaenia turfosa West & G. S. West. 



Medium-sized ; cells sub-cylindrical, elongate, nearly straight, 

 or slightly curved, about twelve times longer than the diameter, 

 gradually attenuated to each pole, apices obtuse ; with a single 

 parietal chromatophore, making i-|- to 2 turns and containing a 

 few small pyrenoids. Length, 100-102 \i\ breadth, 7'5-8'5 \).\ 

 breadth of apices, about 4 \x. 



Mid W. — Ilkley, in peaty pools. 



This species approaches S. parvula Arch., but is of much 

 larger size, is proportionately longer, has more rounded and 

 relatively wider ends, and has more turns of the spiral. 



155. Spirotaenia fusiform is West & G. S. West, 



Small, elongate; cells straight or often slightly oblique, ten to 

 twelve times longer than the diameter, cylindrico-fusiform, 

 attenuated towards the apices which are acute but rounded ; 

 with a single parietal chromatophore rather irregularly disposed 

 from pole to pole and making about half a turn. Length, 

 42-58 /a; breadth, 4*3-4'6 /x. 



1 



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Trans. Y.N.U., 1896 (pub, Sepu 1900). Bot, Series, Vol- 5, 



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