STAURASTRUM. 



217 



This variety varies very much in the form of the semicells. The Burmese specimens are Urn 

 pyramidate, with convex sides, and the apices are broader and less retuse (PL xv, fig. 30). 

 We also figure for comparison some examples from Ceylon which show considerable variation in th* 

 form of the semicell. We have previously mentioned that the "var. punctuktum" probably differs 

 in no way from Turner's St. retuaum, as all the tropical forms of this species which hive since 

 been found are punctulate, and Turner himself was very doubtful concerning the point. 



140. Staueasteum l^vispinum Biss. Desm. Windermere, 1884, p. 195, t. 5, £. 5. 



Var. tropicum var. n. (PI. xvi, fig. I). 



Cellulae subduplo latiores quam long® (cum processibus), corpora semioallularum 

 depresso-globoso, sinu acutangulo levisaime acuminato ad apicem, procewibus Irvitor 

 crassioribus ; semicell ulae a vertice visae 4 radiatse. 



Long, sine proc. 20/t; cum proc. 25/*; lat. cum proc. 36-:%; lat. is! Inn. 9*5/4. 

 Sab. — Mansang, near Hsipaw (No. 24193). 



141. Staueasteum Avicula Br£b. in Ralfs, Brit. Desm. 1848, t. 23. f. 11. 



Var. eotundatum var. n. (PI. xv, fig. 25). 



Cellulse lj-plo longiores quam latae, angulis rotundatioribus cum apinii distinctia 



binis instructis; membrana irregulariter granulata. 



Long. 37-5-39/s lat. sine spin. 31-36,*; cum spin. 38-44 M ; lat. istbm. 9--V 





ifa&.—Mansang, near Hsipaw (No. 24193). 



The relative proportions and the rounded angles of the semicelis characterise thit variety. It is 

 granulate almost as in var. subarcuatum (Wolle) West. 



142. Staueasteum peotectum sp. n. (PL xvi, fig. 12). 



St. submediocre, pame duplo latins quam longum (cum processibus, profui.de 

 constrictum, sinn valde aperto ; semicellul* late subtnangulares, manrimbus mfermnbui 

 subrectis, apice leviter convexo, angulis in processus validos snblongos sursum d.ver- 

 gentes snbglabros (sparse et delicatissime punctatos) product, apicibus proc^uum 

 spinis longis dnobus praditis ; apicibus semicellulamm verrucis parvis b.dont.oulatis 

 cfrciter 4 et verrucis iis similibus 2 infra apicem ornatis ; a verhce t** tr^ngu- 

 lares ? lateribns subrectis, angulis in processus validos product,, verrucis V™J^ 

 culatis duobus ad medium marginis lateralis uniuscujusque et cum annulo verrucamm 



6 intra margines iis similium. t m 



, 9* mm nroc 46,*; lat. cum proc. 66**; lat. wthni. b'on. 

 Long, sine proc. 2d/m, cum proc. t^ , ■» r 



Bab.— Mansang, near Hsipaw (No. 24193). - 



This species . nearest to S, .— J* ^ £-, >£ J ,* \£t J 



but differs in the longer processes, which are turni8ne ^ rtg ^ ftre gmall and bidentimlate-not 

 more slender spines, in the ring of six apica ^ q{ & ^ o{ gmftU bid enticulate warts 



Wfnw. ft t« nrocesses as in St. arcuatum), and in tne p hidenticulate warta on earh 



bifurcate processes 



thus twelve 



fc : middle of each side of the vertical vie.. ^J^ZTtU 

 _!_.! . „•„„ ,t dr aoical ones and three pairs of lateral 



are smooth in 



-* " *»* V^„"*1SS^ «. IBM. t. 46, «*• 13 and H) 



name of 



Wolle has figured a Staurastrum (Desmids U. &• . ■» ^ I{ Wolle ' 8 vertical 



_,^ ^2 ^ewhat resembles St. Pactum, but his ngur ^^ h ^^ 



St. arcuatum which somewhat resembles bt. P™° c ™> ion of a number 



view is correct, his plant agrees with St. P"*?"* ., tw0 ^e very different 



warts 



His plant agxtro *.**- — w , , we 



outward from and in other character, the two 



from each other. 



Boy. Bot. Gard. Calcutta Vol. VI 



