CLOSTERHJM. I :> > : > 



i:U: Khvlm. Alt;-. Sclilcs. L878, p. L40; W<>11<-, Dt-sin. U.S. iss|., p. II, 

 t. 7, f. 5; Cooke, Brit. Desm. 1SSC,, p. 21., 1, 1:5, f. 4; ILuis--. I'l-mlr. 

 Algenfl. Holim. 1SSS, p. 212; De Toni, Syll. A1-. ISS9, p. si:>, ; West, 

 Ali;-. W. livlaml, 1S92, p. 122; BiJr-j. Ferskv. ali;-. Ostgronl. 1S9L, p. 11, 

 t. 1, f. 2; Koy. & Bias. Scott. Desm. IS'.H, p. 21.0: X<>r<lst. In.lcx Dt-.sin. 

 is'.ili, p. 150; West& G. S. West, Al--. S. En--laii.l, ls.)7, p. 1S1 ; Al^a-H. 

 Yorks. 1900. p. I!); Alg. N. Ireland, 1902, p. 21; Scott. Freslnv. 

 Plankton, I, 1903, p. r>2r>. 



Cl. !>:<iii,-i' c. Jenneri Klebs, Desm. Ostpreuss. p. 12, t. 1, f. 12 b, t'. 13 a. 



Afthrodia Jenneri Kiintxe, Kevis. gen. plant. 1891, p. 883. 



Cells small, 8-12 times longer than their diameter, 

 strongly curved, more so towards the extremities than 

 in the median portion, outer margin 150-175 of arc, 

 inner margin not tumid, sometimes almost straight for 

 a short distance in the middle, gradually attenuated to 

 the apices, which are obtusely rounded ; cell-wall smooth 

 and colourless; chloroplasts with four or six ridges, 

 and with 1-0 pyrenoids in a single series ; terminal 

 vacuoles with one or two large moving granules. 



Zygospore oblong-ellipsoid, smooth. 



Distance between apices -18-U4/A; breadth 7-14 /x ; 

 breadth of apices 2'5-5'5 /x ; length of /ygosp. oO-37 ^ ; 

 breadth of zygosp. 120-:30 /A. 



ENCLAND. Cumberland! Westmoreland ! (///x.sv/7). 

 W., N., and E. Yorks ! Lancashire ! Leicester ( li<>//), 

 Surrey! (l{<tlfx). Sussex (Hnlfi). Hants! (Ralfs). 

 Devon! Cornwall! (Ralfs). 



WALES. General in Carnarvonshire ! Ffestiniog, 

 Merioneth! Holy head, Anglesey! 



SCOTLAND. Sutherland!, l\oss, Aberdeen, Kincar- 

 dine, For Far! , Perth ! , Argyll, Arran (iioij ,\- .///.s.sv//.). 

 A vi- ! Dumfries ! Lewis and N. Uist, Outer Hebrides ! 

 Shetlands! 



ICELAND. Donegal! Mayo! (ialway! Kerry! 

 Down! Antrim! Dublin and Wicklow (Archer). 



(li'oijf. J)isti-ilnifiim. France. Germany. Galicia. 

 Hungary. Italy. Spain. Norway. Sweden. Born- 

 holm. N. and' S. Russia, Faeroes. Nova Zembla. 

 Greenland. Siam. Java. Central and E. Africa. 

 A /ores. United States. Brazil, 



CL Jennnri is easily distinguished from (7. />arnilitin l>y its 

 stronger curvature and by its more robust extremities. From 



