THE ALGA-FLORA OF CAMBRIDGESHIRE. 219 
139. C. srretum Bréb. 7. The Washes, Sutton, abundant: 
oe ron 
a ocHTHopES Nordst. 5. Chippenham Fen. 6. Roswell 
Pits, Ry. 8. Guyhirne 
ar. SUBCIRCULARE Wille. 3. Wimpole Park. 
141. C. speciosum Lund. 5. Chippenham Fen. 
142. Sraurastrum apicutatum Bréb. 5. Wicken Fen. 
143. 8. paxilliferum, sp. n. (Pl. 396, fig. 8). S. submediocre, 
paullo longius quam latius, profunde constrictum, sinu aperto sub- 
rectangulo cum apice submam millato; semicellule subelliptice, 
ventre quam dorso convexiores, angulis subacutis et apiculatis, 
dorso cum apiculis circ. 6 et ad marginem inferiorem apiculis 2 
prope angulos utrobique, abit in Seebtis sparsis concentricis 
circa angulos; a vertice vise triangulares, lateribus subrectis vel 
leviter convexis, angulis subacutis apiculatisque, cum apiculis 
parvis so in seriebus transversis circ. 8, in centro anes 
one . 86°5-40 ww; lat. (cum apic.) 82-88°5 p; a isthm. 12°5 
m Wicken Fen : Aug. 1898. 
This species I have Sg observed abundantly from North York- 
shire. It may be compared with S. brachyacanthum Nordst. 
(Hedwigia, 1883, Beli from which it is distinguished by its larger 
size, its much more open sinus and consequently differently shaped 
se micells, as well as by the somewhat different arrangement of the 
apiculations. It will also bear comparison ott 8. - lunatum Ralfs 
(Oesterr. Botan. 
Zeitschr. ints 24, t. xvi. f. 27), and also S. tristichum Elfv. 
‘Finsk. Des Acta Soe. pro Fauna et Flora Fennica, ii. no. 
Helsingfors, 1837, 8, t. i. f. 4) is an allied species, 
144. §. Avicuta Bréb. Most of the forms observed were finely 
granulate, and the spines at the angles were reduced. Long 
34:5 w; lat. c. spin. 84°5 p; lat. isthm. 11 p (Pl. 896, fig. 10). 
6. Roswell Pits, Ely. 
S. orstcunare (Ehrenb.) Ralfs var. pepREssuM — et Biss. 
2. emai! Fen, 1 mile 8. of 6m Iford. 5. Wicken Fen 
6. S. puncrunatum Bréb. Wicken Fen. A pons with the 
lateral angles in the front view slightly produced; long. 31 p; lat. 
81 i at. isthm. 8:5 p. 2. Dernford Fen, 1 mile 8. of Shelford. 
s. ae (Ehrenb.) Wittr. Syn. S. tricorne Ralfs. 
‘ Rove Pits 
8. INFLEXUM en 2. Dernford Fen, 1 mile 8. of Shelford. 
5. Wisin Fen ; Chippenham Fen 
S. crenunatum (Nag.) divi 2. Dernford Fen, 1 mile 8. 
of Shelford. 
150. Hyanormeca pissmens (Sm.) Bréb, 5. Wicken Fen; 
Chippenham Fen. 
for) 
