‘THE ALGA-FLORA OF CAMBRIDGESHIRE. 217 
forma Boldt (‘ Desm. rn Grénl.,’ 2r ra Aas Vet.-Akad. Handl. 
Bd. 13, Afd. iii. no. 5, 1888, t. i. f. 18), but are of course much 
smaller. They approach nearly to 4 Efvingté Racib. in Pamietnik. 
Akad. Umiej. w Krakowie, Wydz. matem.-prz. x. 1885, 83 (= 
C, hewagonum Elfy. in Acta Soe. Founa et Flora Fennica, ii. no. 2, 
nie a t. i. f. 8: non C, hewagonum Nordst. 1870). 
. C. ancustatum (Wittr.) Nordst. Syn. Kuastrum binale 
(Tarp) Khren a var. angustatum Wittr.; Huastrum polare Nordst. 
5. Chippenham 
121. C. pirriciLE pages 5. Chipvenhatn Fen; Wicken Fen. 
122. C. exiguum Arch. 65. a Fen. Long. 14°5- 
15 »; lat. 9°5-11°5 pw; lat. isthm. 8 
3. C, susstriatum Nordst. Burwell Load; Wicken Fen 
6. Roswell Pits, Ely. 7. Sutton West Fen. 8. Twenty- foot River, 
between March and Guyhirne. 
124, C, TETRAOPHTHALMUM ok es 5. Chippenham 
Fen; Wicken Fen. 7. Sutton West F 
125. C. marearitatum (Lund.) hae ae Biss. Syn. C. 
Bréb. var. margaritatum Lund. Very large forms: long. 4 a : 
int 77 mw: lat. isthm. 29 pw. 6. Chippenham Fen, abundant, Aug. 
1898. 
126. C. marcaritivervM (Turp.) Menegh. 6. Roswell Pits, Ely. 
12 a the RENIFORME (Ralfs) Archer. 5. Wicken Fen. 7. Sutton 
West F Most of the forms from Wicken Fen had the basal 
angles of the semicells subrectangular, and in this ss they 
resembled ee eee nen est & G. 8. West (‘Some Desm. of U.S.,’ 
Journ, Linn. Soe. bot. ee 1898, 307, pl. 17, f. 11). lokg: 58 p; 
lat. 46 3 lat. ar beats 
Var. COMPRESSUM bike in Bot. egal one 159; in es 
Sv. Vet.-Akad. Handl. xxii. no. 8, 46, t. f. 5; West &G 
West, /.c.f.10. Long. 46 p; lat. 48 p; calea 14p. 8. Tweuity. 
foot River, between March and Gu ae 
128. C. puncrutatum Bréb. Wi Bins Park. 5. Wicken 
en. 6. Roswell Pits, Ely. 7. Sutton West Fen. 8. Twenty- 
foot River, between March and Guyhirn 
*129. C. Becxu Gutw. in Glasnika batho Muzeja u Bosni t 
Hercegovini, 1896, iii, 876, t.i.f.7. Long. 29 »; lat. 25 »; lat. 
isthm. 6 »; crass. 14°5 p uyhirne, ‘er pale. (Pl. 395, tig. i 
ay: resembles C. subcostatum Navdet. (in Wittr. et Nordst. ‘ Des 
et Gidog. in Ital. et Tyrol.,’ Ofv. af K. Vet.-Akad. Foérh. 1876, 
no. 6, 37, t. xii. f. 18) very closely, the ee being a little more 
elevated, and the central granules having a slightly different 
of C. subcostatum figured by Schmidle in Beri aed d. Deutschen 
Bot. Gesellsch. 1892, Bd. x. Heft me e ps Hay © Gutwinski’s 
name is unfortunate, as there is a widely disicibeted species of 
genus with the name C. Beckii Wille (‘ Bidrag til Kundsk. om 
