f 
f 
THE ALGA-FLORA OF CAMBRIDGESHIRE. i111 
Prussian Silesia. The Cambridgeshire specimens were of variable 
length, and all had the poles truncately rounded; certainly more 
truncate than figured by Lemmermann. With regard to the cell- 
contents, Lemmermann states (/.c. 116): ‘‘ Das Chlorophor besteht 
aus einer axilen Platte, wie sie sich in ahnlicher Weise bei der 
attung Mougeotia Ag. vorfindet.”’ All the examples alarers were 
packed with pie of an oily nature, as is so often the case in 
species of this genu 
78. Pentum pictus (Khrenb.) Bréb. 7. Ponds S. of March. 
79. P. sp. Long. 27 »; lat. 18 w. Only one specimen n of this 
species was observed ; the. cell wat ‘oblong- elliptical, with semi- 
circular hist and in the middle there was a faint constriction. 
. Guyhirn 
80. P. cructrerum (De ed Wittr. Syn. Cosmarium cruciferum 
DeBary. 5. Chippenham Fen 
81. CLosTERIUM PRELONGUM Bribe BREvIoR West. 8. Lord’s 
Bridge 
82. OC. Prircnarpianum Arch. 3: Sheep’s Green, Cambridge. 
*83. C. peracerosum Gay, Essai Monogr. pt e ae eam 
1884, 75, - ii. = 18; Bull. Soe. Bot. Fr. 1884, x 
Var NS, va Var. cellulis stopantidll apices versus 
plus atteenc eurvatis ue, ventre paullo tumidioribus, apicibus 
angustis sed obtusis ; pyrenoidibus in semicellula unaquaque 5-8 ; 
locellis apicalibus parvis subterminalibus et corpusculis singulis vel 
binis includentibus. Long. 196-258 p; lat. 14-15 p (Pl. 396, 
3; 
"4 3. Comberton. 7. Sutton West Fen 
This ere is easily distinguished ‘from the typical form by 
its somewhat more pronounced curvature its greater attenuation 
towards the apices, which are rounded, and by the Seren Basary 
of the apical locelli; be is also slightly larger, and has ore 
pr eosin ventral in 
. O. AceROSUM ( Schrank) Ehrenb. 2. Dernford Fen, 1 mile 
S. ; “Shelfo rd. 8. Hardwick; poe Bridge. 5, Wicken Fen: 
An elongated variety of this species was “observed from Sheep's 
portion of the cell, and attenuated rounded apices. The cell- 
membrane was of a pale straw-colour and very finely price # 
and there were 10-11 pyrenoids in each = In its dimensions 
and in the parallel lateral — it agree with var. angolense 
West & G. 8S. West (‘ Welw. Afric. Alg.,’ seg Bot. ea Mag but 
the cell-membrane is ae tere Long. 725 yw; lat. 
*Var. aNGOLENSE West & G. S. West, /.c. 6. Roswell Pie, Ely. 
Long. 773 p; lat. 80 p 
85. C. panceotatum Kiitz. 7. The Washes, Sutton. 
86. C. Luyuxa (Miller) Nitzsch. A rather small form with a 
faintly straw-coloured ce vote -membrane ; long. 875 p; lat. 58 p 
8. Sheep’s Green, Cambrid 
