106 ZYGOPHYCES. 
Genus 50. STAUROSPERMUM. Kutz. (1843.) 
Spores four cornered, between the truncated corners of four 
sessile lateral cells (cells of all the species up to twenty times 
longer than broad.) 
t Sporoderm porose. 
8. quadratum, Hass, 
+t Sporoderm verrucose. 
8. gracillimum, Hass. 
ttt Sporoderm smooth. 
8. capucinum, Kutz. 
S. viride, Kutz. 
+ Sporoderm porose. 
Staurospermum quadratum. (Hass.) De Bary. 
Sterile cells 10 to 20 times longer than broad. 
Epispore quadrangular, with the angles truncate, not repli- 
cate, sides straight, covered with large-pores (about 50 on the 
longer side). 
Size. Cells -015-02 mm. Zygospore :04--044 mm. 
De Bary Conj. p. 81, t.8, f.11. Cleve Mon. Zyg. p. 34, t. 
10, f. 3. Rabh. Alg. Eur. iii. 259. 
Staurocarpus quadrangulatus, Hass. Aun. Nat. Hist. xi. p. 
434. Jenner. Fl. Tunb. Wells, 184. 
Staurocarpus quadratus, Hass. Alg. 178, t. 48, f. 1. 
Mougeotia quadrangulatus, Hass. Ann. Nat. Hist. xii. 185, 
t. 7, f. 3. 
? 
In ponds, ditches, &c. 
Plate XLIII. fig. 2. a, sterile cells X 400; 6b, b, conjugating cells 
with zygospores x 400. 
tt Sporoderm verrucose. 
Staurospermum gracillimum. (Hass.) 
Sterile cells 8 to 15 times as long as broad, pale yellowish 
green. 
Zygospore quadrate, the sides deeply sinuate, angles retuse. 
Sporoderm verrucose. 
Size. Cells 006008 mm. Zygospore ‘02 mm. diam. 
De Bary Conj. p. 81. Rabh. Alg. Eur. iii. 260. 
Staurocarpus gracillimus, Hass. Alg. 179, t. 49, f. 2. Jenner 
Fl. Tunb. Wells, 184. Hass, Ann. Nat. Hist. xii. 185, t.7, f. 6. 
In bogs and moor pools. 
Plate XLII. fig. 3. uw, sterile cells X 400; 6, conjugating cells with 
zygospores X 400, 
