SS ce aaa si < 
THE ALGA-FLORA OF CAMBRIDGESHIRE. 118 
96. C. tinzarum Ehrenb. 5. Chippenham Fen; very large 
forms : long. 690 pw; lat. 29 »; lat. apic. circ. 7 » 
97. C. rostratum Ehrenb. 2. Octagon Pond, “Wimpole Park: 
frequent amongst Potamogeton natans. 
98. C. Kirzinan Bréb. 5. Wicken Fen; Chippenham Fen. 
99. C. cracttz Bréb. 5. Chippenham Fen: somewhat scarce, 
pa bea Long. 188-238 pw; lat. 5°5-6 p 
C. pronum Bréb.. 38. Wimpole Park: 5. Wicken Fen; 
Chisipetitee Fen. 7. Near March. tone 384-423 p; lat. 8-8°5 p, 
101. C. suspronum West. 5. Wicken Fen. Long. 716 p»; 
lat. eA 
eo: ACUTUM (Lyngb ) Bréb. 38. Sheep’s Green, Cambridge. 
5. Burwell Load; Wicken Fen. 
103. Prevrormnium coronatum (Bréb.) Rabenh. var. nopuLosum 
(Bréb.) West. Syn. Pleurotenium nodulosum (Bréb.) DeBary. 5. 
Chippenham Fen. The specimens possessed a circlet of eight small 
granules at the apex of each ae long. 400-441 »; lat. ad bas. 
goa ae p, ad apic. 24— 
be ee ky ‘Nig. 5. Chippenham Fen ; 
Peas ea 6. Ros Pits, Ely. A large specimen of this 
species was noticed rile Wicken Fen with two undulations at 
the ay ae each semicell; long. 664 p; lat. ad bas. semicell. 46 p, 
ad a 
ace Sees (Pl. 396, fig. 6). Forma membrana distinecte 
granulata, granulis itregalatiter ordinatis. Long. 486 p; lat. ad 
bas. semicell. 3°5 p, ad apic. 25 p. 5. Chippenham Fen. This is 
an analogous form to P. Ehrenbergii var. granulatum. 
Esrenserci (Bréb.) DeBary. 5. Chippenham Fen 
base of each semicell, the third one rt very slight, and with a 
distinctly narrowed apex ; long. 582 p; ad bas. semicell. 87 p, 
ad apic. 18 2 infra apic. 28 p» (Pl. 396, ge 
Another form (Pl. 396, fig. 5) somewhat approached var. undu- 
latum Schaars ania (in Magyr. Tudom. Akad. Math. s. Természettud. 
Kézlemények, xviii. 1882, 278, t. i. f. 21), but the upper third of the 
semicells was destitute of undulations. It is intermediate between 
the two forms figured by Schmidle in ‘ Hinige Algen aus Sumatra,’ 
Hedwigia, Bd. xxxiv. 1895, 300, cum fig. Cfr. also the form of P. 
Ehrenbergii described by Borge (‘ a Chlor. Austral,’ Bih. rg 
K. Sv. Vet.-Akad. Handl. 1896, Bd. Afd. iii. no. 9, 26, t 
f. 46) as “ Docidium basiundatum re cee 17-19-plo pete 
apicibus attenu ; this form of Borge’s is certainly not Pleuro- 
tenium Uadeee: West & G. 8. West (‘ Freshw. Alg. Madagascar,’ 
Trans. Linn. Soc. bot. ser. 2, v. 1895, a - v. f. 85). Long. 
709 a ; lat. ad bas, semicell. 40 = ms oie: 
. Evastrum insutare (Wittr.) Roy in on tt. Naturalist, 
Apell, 1877. Syn. EF. binale . (Turp.) Ehrenb. var. insulare Witir. in 
Journat or Borany.—Vou. 37. [Mancu, 1899.] I 
