33 



NOTES ON FRESHWATER ALGJE: 

 WITH DESCRIPTIONS OP NEW SPECIES, 



W. BARWELL TURNER, F.R.Micr.S., F.C.S. 

 Ex-Preside7it of the Leeds Nafreratists' Club. &>c. 



References to Plate. 

 Fig. i.- — Mesotcenium De Greyii, five forms X 500. 

 Fig. 2. — Docidium verticillatum X 255. 

 Fig. 3. — Penium ( Cylindrocystis) curtum X 500. 

 Fig. 4. — Staurastrum quadri-spinatum X 500. 

 Fig. 5. — Micrasterias platyptera X 255. 



Fig. 6. — Euastrum or Cosinarium ? a very puzzling form extending in its 

 varieties from the rounded form of Eu. binale (Turp.) almost 

 to the figure of Cosm. crennlatum (Ehr.) Nag. Very common 

 in varietal forms at Strensall x 500. 



Fig. 7. — Odontidiiim hyemale X 450. 



Fig. S.—Odont. mesodon X 450. 



Fig. 9. — Himantidium gracile, attenuate form (side view) x 500. 

 Fig. 10. — Cosmarium Regnesi X 500. 



The dry summers of 1884 and 1885 will long be remembered by 

 both naturalists and fishermen, for their poor yield of sport for micro- 

 scope and rod ! Those microscopists who sought more especially 

 the peaty pools of our moorlands had a thoroughly ' bad time ' of it, 

 many of the promising ponds and beds of Sphagnum and Utricularia 

 being completely dried up. It was therefore hardly to be expected 

 that the journey of the Yorkshire Naturalists' Union to Blubberhouses 

 (on 26th September, 1885) would yield any great results from such 

 habitats; and expectation being wanting, disappointment at the 

 paucity of the ' catch ' could not exist. 



Our courteous host kindly suggested my examination of two little 

 rock pools (situated on the summits of the highest masses of rock, 

 which form so striking an addition to the scenery of Blubberhouses 

 Moor) which are never dry. In these I regret to say that I found 

 only Microspora vulgaris Rabh., with what appeared to be Conferva 

 tenerrima Kiitz., mingled with atoms of sheep's wool, feathers, and 

 plumules of lepidoptera ! My list of algae is as follows : — 



Microspora vulgaris Rabh. Lyngbya rupesti-is Agh. 



Conferva (tenerrima ? Kiitz. ) Zygogonium ericetorum De Bary, 



C. fontinalis Berkeley. terrestrial and aquatic forms. 



Microthamnioti vexator (Turner) Cooke. Staurospermum gracillimtim Hass. 



Leptothrix ochracea Kiitz. 



DIATOMACE^. 



Himantidium undulatum W. Sm. Navicula rhomboides Ehr., extending 



* H. gracile Ehr., attenuate form. to 3,000 ft. altitude. 



*Surirella biseriata Breb. Synedra N. cuspidata Kiitz. 



ulna Ehr. , very large, long. 202 p> = Diatoma elongatnm Agh. var. y 



•008 in. W. Sm. 



Feb. 1886. 



