= Te ae a EET 
THE ALGA-FLORA OF CAMBRIDGESHIRE. 55 
paullo curvato. Crass. cell. veget. 19-21 p; altit. 8-5-plo major; 
crass. oogon. 67-69 y»; altit. 59-61 »; crass. nannandr. 10-138°5 p; 
altit. 25-34 ». 6. Roswell Pits, Ely; among Utricularia vulgaris, 
y ; 
Perhaps the nearest species to this are B. borealis Wittr. and 
B. setigera (Roth) Ag. From the former it is distinguished by its 
ar bee tonper cells and much larger oogonia, and from the 
latter by its smaller cells, the form of the oogonia, the smooth 
Sion and the position of the septum cutting off the supporting 
cells. 
8. B. sussmmpLex Wittr. 7. Ponds near March. 
9. B. rectaneunaris Wittr. 5. Wicken Fen; Chippenham Fen. 
10. Cipocontum curvum Pringsh. 8. Wimpole Park. 
*11, GH. rracme Wittr. 7. Ponds 8. of March. Crass. cell. 
— 12°5-14:5 p; altit. 34-5-plo — crass. oogon. 44 p; 
tit. 50 »; crass. oospor. 40 he altit. 41 p 
*12, CH. Pyrutum Wittr. var. oBEsum naa 2. Dernford Fen, 
1 mile 8. of Shelford. Chat. eull veget. 12-5- 18°5 p; altit. 24-4- 
plo pa a eh 34-35 pw; altit. 84-5-87 pw; crass. oospor. 
28-30 p t. 28-30 p 
13. CE. VERNALE (Hass. ) Wittr. 2. Dernford Fen, 1 mile 8. of 
Shelford. 
14. GE. Vavonern (Le Cl.) A. Br. 8. Wimpole Park. 
15. Gi. ostoneum Wittr. Sheep’s Green, Cambridge. 
16. Gi. Rorum (Le Cl.) Pringsh. 2. Dernford Fen, 1 mile S. 
of Shelford. 
17. G. unputatum (Bréb.) A. Br. *var. Moesrusu Schmidle 
a Alg. aus Austral., ‘sro 1896, Bd. 82, Heft 3, 297, t. ix. 
5. Chippenham Fen 
GS. crassi assipellitum, sp. n. (PI. 394, figs. 3-5). CE. dioicum, 
debnanecias oogoniis singulis (raro binis), subglobosis vel glo- 
bo so-oboviformibus, poro superiore aperto; oosporis globosis ~ 
subglobosis, Laer oogonia complentibus ; membrana oosporar 
maturarum sissima glabraque; cellulis suffultoriis aitlie 
tomiduite vel = gadeta forma ac cellulis vegetativis ceteris; nan- 
dria is et subrectis, in cellulis suffultoriis sedentibus, 
antheridio unicellulari. Crass. cell. veget. 31-36 p; altit. 3-4-plo 
p 
95 »; erass. cell. antherid. 7°5-9°5 p; altit. 13-5-16 »; crass. 
membr. oospor. 5°5-7°5 ». 8. Twenty-foot River, between March 
and Guy vie: July, 1898. 
This species seems to be quite characteristic, being the only 
diccious nannandrous species having vegetative cells over 30 p in 
thickness and at the same time globose oogonia ; moreover, the 
mature oospores, which scarcely fill the oogonia, larly 
thick wall, and are of a golden-brown colour. It is probably nearest 
- Hutchinsia Wittr. (Cfr. Boergesen, ‘Nogle Ferskv. alg. fra 
