62 UJUTLSH DESMIDIACE.E. 



C. TJiwaitesii Ralfs b. majus Rabenli. Flor. Europ. Alg. Ill, 1868, p. 175 ; 



Wittr. Skandinav. Desm. 1869, p. 14, t. 1, f. 5. 



C. Debaryi a. typicum Klebs, Desm. Ostpreuss. 1879, p. 28, t. 3, f. 46. 

 Calocylindrns Debaryi Wolle, Freshw. Alg. U. S. 1887, p. 27, t. 56, f. 12 



Cooke, Brit. Desm. 1887, p. 128, t. 44, f . 4 ; West, Alg. N. Wales, 1890, 



p. 291. 

 Cosmaridium Debaryi Hansg. Prodr. Algenfl. Bohm. 1888, p. 246 ; 



Heimerl, Desm. alp. 1891, p. 595. 

 Pleurotxniopsis Debaryi De Toni, Syll. Alg. 1889, p. 906; Lutkemuller, 



Chlorophyllkorper Desm. 1893, p. 47, t. 3, f . 25 ; Desm. Attersees, 1893, 



p. 548. 



Cells large, about twice as long as broad (or rather 

 more), moderately constricted, sinus open and acute; 

 semicells subquadrate, sides subparallel, straight, 

 slightly convex or even faintly retuse, basal angles 

 rectangular but rounded, apical angles broadly rounded, 

 apex truncate-convex or convex. Vertical view almost 

 circular, very slightly compressed. Cell- wall very 

 minutely punctate. Chloroplasts parietal and band- 

 like, about five in each semicell, each band with 

 numerous small and rather irregular lobes pressed 

 against the inner side of the cell-wall, and with 2-4 



o 7 



pyrenoids ; central part of each semicell occupied by 

 a rather conspicuous hyaline vacuole. 



Zygospore unknown. 



Length 100-112 /x; breadth 46-54 p. ; breadth of 

 isthmus 27*5-39 p. ; thickness 46-50 JJL. 



ENGLAND.- -Angle Tarn, Cumberland ! Brothers' 

 Water!, Scandale !, Loughrigg !, and near Bowness 

 (Bissett), Westmoreland. Adel Bog, W. Yorks ! Pil- 

 moor, X. Yorks ! Sub-fossil in peat deposit at Filey, 

 E. Yorks ! Xear the Lizard, Cornwall ! 



WALES.- -Capel Curig and Llyn Bodgynwydd, Car- 

 narvonshire ! 



SCOTLAND. Inverness, Aberdeen, Kincardine, Perth ! 

 (Roij $' Bissett) . Kircudbright ! Lewis, Outer Hebrides ! 



IRELAND. Near Glen ties, Lough Anna, and near 

 Lough Magrath, Donegal ! Xear Westport, Mayo ! 

 Ballvnahinch and Derrvclare Louo'h, Galway ! Louo-h 



it . t/ O 



Guitane and near Lough Brin, Kerry ! Dublin and 

 Wicklow (Ai'clt(. j r). 



Geogr. Distribution. Germany. Austria. Xorway. 



