106 ZYGOPHYCE.E. 



GENUS 50. STAUROSPERMUM. Kutz. (184,5.) 



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. 



S. quadratum, Hass, 

 ft Sporoderm verrucose. 



S. gracillimum, Hass. 

 ttt Sporoderm smooth. 



S. capucinum, Kufe. 

 S. viride, Ruiz. 



f Sporoderm porose. 

 Staurospexmum 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. Kabh. Alg. Eur. iii. 259. 



Staurocarpus quadrangulatus, Hass. Ann. Nat. Hist. xi. p. 

 434. Jenner. Fl. Tunb. Wells, 184. 



Staurocarpus quadrat us, 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 ; b, 6, conjugating cells 

 with zygospores X 400. 



ft Sporoderm verrucose. 

 Staurospermum giacillimum. (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 -006 '008 nim. Zygospore -02 mm. diam. 



De Bary Conj. p. 81. Babh. Alg. Eur. iii. 260. 

 Staurocarpus grftcillimus, 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 XLIII. fig. 3. a, sterile cells X 400 ; I, conjugating cells with 

 zygospores X 40*0. 



