ISO IIKITISII KKSMIDIACK.K. 



Cells small, moderately curved, 17-20 times longer 

 than their diameter, outer margin 28-- 1-5 of arc, inner 

 margin slightly tumid, gradually attenuated from the 

 middle towards the apices, which are acutely rounded ; 

 cell-wall smooth and colourless; chloroplasts with 

 three or four pyrenoids ; terminal vaeuoles with 

 several moving granules. 



Zvgospore subglobose or ovoid-globose, smooth. 



Length 102-lSO/u,; breadth C> 12'5/z; diam. /vgosp. 

 19-23 /A. 



Exui.Axn. RombaldV Moor, Cockett Moss, and 

 Cain Fell, W. Yorks ! Great Shunnor Fell, Lund's 

 Fell, and Craydale Moor (1,000 ft,), N. Yorks! 



WALKS. Capel ( 1 urig, Carnarvonshire ! 



SCOTLAND.- - Briu, Inverness; Aboyne, Aberdeen; 

 Glen Coe, Argyll (ltn,j $ Vixxett). 



|I;KI.AXI>. Lough Aunierin, and near Oughterard, 

 Gal way! Adrigole, Kerry! 



dcinji'. Distribution. Austria, Norway. Sweden. 

 Tinted States. 



Tins small species differs principally from ('/. acultim in the 

 slightly tumid inner margins nf the cells, in t lie more rounded 

 jvpiees, mid in tlie suh^loliose /,y<_;'<>s]><>re. 



5:1. Closterium idiosporum AVest & G. S. West. 

 (PL XXIII, figs. 20, 21.) 



Closterium iilif^fn-mn West & G. S. West, Notes Alu;. II, !<><>, p. iMKi. 

 t. Mi', f. 0, 7. 



Cells small, slightly curved, 20-23 times longer than 

 their diameter, outer margin about 25 of arc, inner 

 niarinn very slightly tumid, median portion of cell 



O / O i/ 



with subparallel margins, gradually attenuated to the 

 apices, which are very narrow but truncate; cell-wall 

 smooth and colourless; chloroplasts with four or five 

 pyrenoids in a median series. 



Zygospore narrowly ellipsoid, seen from the end 

 circular; wall somewhat thick and densely scrobicu- 

 late. 



