MKSOT/ENfUM. ">? 



Var. grande Xordst. (PI. TV, fig. 22.) 



M. Endlicherianum var. <\, .-.// Xordst. in AVitlr. >v Xordst. Alg. KxrU 

 1S79, no. 271: Lagerh. rhyi-opnrph. ISlC,, p. 24; Wittr., Nordsl.. A 

 L:u;vr]i<-ini, Ali;-. Kxsic. 1896, fasc. 29, no. 14o< ; West & <i. S. West, 

 Alg. S. England, 1897, p. 478 ; Alga-fl. Yorks. 15)00, p. 42. 



A larger variety, often twice as large as the type, 

 with two pyrenoids in each semicell ; cell-sap often 

 violet. 



Zygospore globose; cell-wall thick and smooth. 



Length 50-54 /*; breadth 12-13/1; diam. zygosp. 

 26-28/j. 



ENGLAND. Cragg Vale, Cocket Moss near Giggles- 

 wick, and near Settle, W. Yorks ! Epping Forest, 

 Essex ! 



WALKS. Gapel Cnrig, Carnarvonshire ! 



(,'coi/i: Distribution. Germany. Norway. 



10. Mesotsenium Kramstai Lemm. 

 (PL III, figs. 23, 24.) 



Mesotxnium Kramstai Lemm. Algenfl. Eiesengcbirges, 1896, p. 115, 110, 

 8-10 ; Nordst. Index Desmid. 1890, p. 277; G. S. West, Alga-fl. Cambr. 

 1899, p. 110. 



Gells cylindrical, often slightly curved, G-8 times 

 longer than their diameter, apices rounded or trnncately 

 rounded ; chloroplast an elongated plate. 



Zygospore unknown. 



Length 44-104 p ; breadth 9-13 /t . 



ENGLAND. Ghippenham Fen, Cambridgeshire ! 



Geogr. Distribution. Germany. W. Indies (var.). 



This is the most elongate species of the genus and in its 

 external form greatly resembles some of the smaller forms of 

 Itoya olitusa. The chloroplast is commonly obscured by dense 

 masses of oil globules. 



Genus 5. CYLINDROCYSTIS Menegh. 1838. 



Menegh. Monogr. Nostoch. 1842, p. 88. 

 Hassall, Brit. Freshw. Alg. 1845, p. 301. 

 De Bary, Conj. 1858, p. 30, 35, 74. 



