STAURASTRUM. 



219 



147 



St. 



m 



Staurastrum M0NTICUL08IF0RMK 



S P 



parvum 



} 



paull 



latius 



(PI. xv, fig. 33) 



quam 



vald 



sinu aperto acuminata ad apicem 



gum ( 



rocessibus) profundissim 



con- 



sem 



subsllipt 



inarpne inferiori 



ter dispositos productis, cum 

 picibus processuuni trident 



margme supenori convexo, angulis in processus breves et crassos horizontal 



circ. 3 granul 



circum processus unumquemqut 



» 



verrucis conicis duobus (distant ibus) infra marginem 



api 



semicellularum 



a vertice visse rhomboideo-ellipt 



polit 



breves et crassos productis, verrucis conicis binis infra basin process 



Long. 27/*; lat. cum proc. 32/*; lat. isthm. 6^; era*. 16m. 



in proc* -us 

 uniuscujufque. 



Hab. 



Mansang, near Hsipaw (No. 24193). 



In the general outline of the front view this species closely resembles St. polymorphum Hnb.. 



but it is at once distinguished from that species 



the rhomboidal character of th» vtrtioal view, 



and by the four conical warts at the apex of each semicell. 



From St. oxyacanthum Arch. var. bicnrne Lund. 



(D 



Suec. 1871, p. 67) it differs in iU 



smaller size, its shorter horizontally-disp 



processes, which are neither 



to -< Ten ate at the 



margin nor bifurcate at the apices 



d in 



arts in plaoe of spinet 



It should also be compared with St. tnonticttloxum Breb. var. rhombovbutn B 

 Chlorophy, 1885, p. 119, t, 6, 1 38), from which it differs in its longer prooestea 

 granulate and tridenticulate at the apices. The conical warts do 



(Siber. 

 h ar 



above the apex of th* 



semicells of St. monticulotiforme, whereas the corresponding dentate projections of St. monticulotuu, 

 always stand out prominently. 



■ 



148. Staurastrum tetracerum Ralfs, 1845; Brit. Desm, 1848, p. 137, t. 23, 



f. 7. 



r 



Var. trigranulatum var. n. (PL xv, fig. 19). 



Semicellulse cum processibu 



paull 



brevioribus et validioribus, a vertice vis* 



lateribus trigranulat 



Long. 



sine proc 



10/i 



cum proc. 19-21/*; lat. sine proc. 7-o-S-5m, cum proc 



22-24^; lat. istbm 



2m 



crass. 5*8-6^ 



Hal 



Man 



near Hsip 



(N 



24193) 



This variety differs from St. Mwerum Haifa Tar. hAUm W. 4 G. 8. West (Alg. Madag., 

 1896, p. 80, t. 9, f. *, in the proportionate* looger body of the semice*, «d i. t * **~ ™*»; «"»£» 



on 



each side of the vertical view. 



Freshw. Alg 1894, p. ]2, t. 2, f. 49, 50), bnt 

 central wart is absent* 



G. S. W 



BemioeUs is too 



149. 



St. 



Staurastrum gyratum sp. n. 



(PL xv, fig. 27). 



minutum, 2J-plo latius quam longum (cum processes) 



» 



modice constrictum; 



» 



semicellulae subtriangulares, lateribus et apice 



leviter convexis, angulis superioribus in 



processus longos tenuissimos 



horizontaliter dispositos subiter productis, 



delicatissime serrato-crenulat*, apicibus processuum 



triangulares, lateribus leviter convexis, 



JSTS obKque dispose . a Dg ».o uno^ue ; m e m b r ana 





processuum 



culatis; a vertice visse 



longos rectos 



glabra. 



Long. 1%; lat. sine proc. Wm cum proc 

 Hat. -Mansang, near Hsipaw (No. 24193). 



marginibui 

 minutissime tridenti- 

 angulis in processus 



27*5-28'5m; lat. istbm. 4m, 



