140 YORKSHIRE naturalists' UNION. 



Mid W. — Baildon. 



N.E. — Pilmoor, near Thirsk; very fine. 



691. Tolypothrix lanata (Desv., 1809) Wartm., 1858. 



[Syn. T. niuscicola Kiitz., 1843; T. fiaccida Kiitz., 

 1843; T. coadilis Kiitz., 1843; T. cegagropila (Kiitz., 

 1833) Rabenh., 1862]. 

 Mid W. — Dringhouses, near York, growing on Hypniun 

 giganteum. Harrogate ! (T. Hick). Soutli Stainley ! (Rev. 

 J. S. Tute). Boston Spa. 

 N.W.— Sedbergh. 

 N.E. — Stokesley. 

 S.E. — Riccall Common. 



692. Tolypothrix tenuis Kiitz., 1843. [Syn. T. pyguKza 



Kiitz., 1843; T. Wartmanniana Rabenh., 1858]. 

 S.W. — Rawclilfe Common, 

 Mid W. — Penyghent. 

 N.W.— Cronkley Fell. 

 N.E. — Near Scarborough. 



S.E. — Riccall Common. Skipwith Common ! (Rev. W. 

 Fowler). 



Genus DIPLOCOLON Nag., 1857. 



693. Diplocolon Heppii Nag., 1857. 



Mid W. — On the vertical face of dripping limestone rocks, 

 Helln Pot, near Selside (vii. 1892). 



This plant was growing amongst and agglutinated with several 

 species of Glceocapsa, and formed an irregularly-lobed subcarti- 

 lagenous thallus of a dark brownish-green colour. The trichoraes 

 are about 8 ju. in diameter, comparatively short, and tortuose- 

 intricate. The margins of the outer sheaths could be seen only 

 with difficulty, and in many cases not at all, but the trichomes 

 were frequently seen both singly and in pairs in evidently inner 

 lamellose sheaths; the latter were either colourless or, in older 

 examples, of a pale yellow-brown colour. The branches arise 

 between the heterocysts. 



Trans. Y.N.U., 1S99 (pub. July 1901). Hot. Series, Vol. 5. 



