(T.osTKUir.M. 179 



Cl. proninn Bn'b. <1. Linen Klehs, Dosni. Oslpn-uss. 1S70, p. 19, t. 2, f. II //. 

 .1 //// /MI//H Li lift FCinit/i', LVvis. L;VH. plnnt. 1891, p. Ss:;. 

 r/fis/.T/Kui iii-ii/inn (Lynn'b. ) I>rrb. v;ir. Liin'n (I'ertv) West A. <!. S. West, 

 ,\|..;.-i-H. Vovks. I'.tilO, p. 57 ; Al\ N. Ireland, 1.902, p. 25. 



Cells straight, or almost straight, sometimes a little 

 curved at the apices which are acute ; chloroplasts with 

 two to four small pyrenoids ; terminal vacuoles fre- 

 quently occupying* one-third the length of the cell and 

 containing from one to eight small moving granules. 



Zvgospore similar to that of the type. 



Length 13-M(.>3/u; breadth 3'8-5/u; length of 

 zygospore 31-41 '5/u,; breadth of zygosp. 13-10/x. 



ENGLAND. -Westmoreland ! W. and N. Yorks! 

 Cheshire (ft"//). Leicester (Roy). Essex! Surrey! 

 Kent! Hants (Bennett). Cornwall! (Marquand). 



WALES. Bog above Capel Curig lakes, and Glyder 

 Fach, Carnarvonshire ! 



Sc'oTLAXD. General, with zygosp. (7?o// cj* ///x.sv//). 

 General in Outer Hebrides ! 



In KI, AND. More or less general ! 



fi'i'ut/r. Distribution. France. Germany. Switzer- 

 land. Austria and Galicia. Norway. Sweden. Japan. 

 Guiana. 



Cl. .LtHfa must he regarded as merely a variety of Cl. 

 ficiifinii as it only differs from that species in its somewhat 

 straighter cells. The zygospores of the two are exactly 

 similar. 



Liitkemiiller gives "length 72-1 10ji; hreatlth 8/1" for Cl. 

 Lini'a, hut we have never observed any British specimens so 

 small as this. 



-V.2. Closterium subulatum (KiH/.) l^reb. 

 (PI. XXIII, figs. 10-19.) 



Frustulia sululata Kiit/. Syn. Diat. 1834, p. 538, t. 13, f. 1. 



Closterium subulatum (Kiitz.) Ihvl). in Chcvul. Des uiicroscop. et leur 



usuge, Paris, 1S39, p. 272; Cooke, Tirit. Desm. 18S6, p. 3(i, t. 15, f. 4; 



West, Alo-. W. Ireland, 1S92, p. 125; Boy & Biss. Scott. Desm. 1SH4, 



p. 249 ; Nordst. Index Desm. 1896, p. 248 ; West & G. S. West, Alga-fl. 



Yorks. 19(X), p. 57. 



? Stauroceras sulnilntit Kiitz. Phyc. g'erm. 1845, p. 133. 

 Closteriutn m-utinn (Lyng'b.) Breb. var. fi Balfs, Brit. Desm. 1848, p. 177, 



t. 30, f. 5 c. 



