KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 5. 95 



Bengal (Elephant Tank, Nov.), G. C. W., 1855; British Burmah, ex Utricularia 

 fasciculata; also from Khasia, ex Utr. sp., comm. G. von L., 1889. 



18. M. Mahabuleshwarensis, Hobson (Notes on Indian Desni., Q. J. M. Sci., p. 168, 1863; 

 Lundell, Desm. Suee. p. 15, t. I, f. 6, 1871; M. Americana f. Mahabuleshwarensis 

 Maskell, On M. Amer. p. 9, t. II, f. 8, 1888). 



Long. 155—160, lat. 125—140, lat. isth. 26, lat. apie. 80—86, lat. lob. pol. 

 21 — 24, crass. 36 «. 



Lundell gives long. 170—220, lat. 160—190, lat. isth. 20, lat. apic. 110, lat. 

 lob. pol. 28, crass. 40 u. 



From a large Indian specimen long. 164, lat. 144, lat. isth. 24, lat. apic. 91, 

 lat. lob. pol. 24 ,u. 



Swedish specimen long. 214, lat. 210, lat. isth. 24, lat. apic. 112, lat. lob. pol. 29 ,«. 



From these eornparisons it will be seen that the European forms are much larger 

 than the Indian type, still they resemble it in all points. The last dimension is from 

 a beautiful Swedish specimen, kindty communicated by Dr. Nordstedt. I cannot agree 

 with Mr. Maskell's suggestion that this and other correlated plants should be fused 

 as forms of M. Americana (and in this view he coincides with Wallich), as the ge- 

 neral habit of the f ronds in outline differs so much, and the zygospores being un- 

 known, absolute proof is as yet impossible. 



T. VI, f. 1. Hab. Central India, J. S. 



— var. excelsior (Wallich) nobis (M. excelsior, Wall. Mscr. No. 81, 1855; 

 M. morsa var. <), Wall. Desm. Beng. 1860, p. 277, t. XIII, f. 10; M. Americana f. 

 excelsior, Maskell, 1. c. f. 7). Var. tumöre centrali carente vel parvo; lobi eeritrales 

 duplices ut in f. typica, sed incisura? parte interne emarginato-pinnatse, non simpliciter 

 aculeatae; processubus lobi polaris erectis non obliquatis nec expansis. Margines omnes 

 versus aculeata, aculeis seriatim ordinatis. 



Long. 130—145, lat. 125—135, lat. isth. 20—25, lat. apic. 55—62, lat. lob. pol. 

 20 fi. T. V, f. 2 (after Wallich). 



Hab. Raneegunge, Nov. G. C. W. 



Continuing mv remarks, I certainly think Dr. Wallich is in error when classing 

 this so closely with M. Americana, M. Baileyi (Ralfs), and M. ringens (Bail.); yet 

 it must be admitted that if the salient points of the specimen of M. ringens figured 

 by Wolle (Desm. U. S. t. XXXV, f. 2) were existent in his other plant, var. serrulata 

 Wolle (Fr. Alg. U. S. p. 41, t. LIX, f. 15) the result would be M. Mahabuleshwa- 

 rensis, minus the 2 intermediate apical processes. As the Desmidiea? are so eminently 

 erratic in form, I venture to predict that the finding of such a form as suggested is 

 but a question of search, and that it will be found! 



19. M. Wallichii, Grunow (Desm. Insel Bänka, in Rabh. Beitr. II, p. 14, t. II, f. 21; in 

 Rabh. Alg. No. 1727; Lundell Desm. Suec. p. 15; M. Americana forma Wallichii, 

 Maskell, 1. c. f. 9, 10). 



Long. 132—154, lat, 120—140, lat. isth. 21—24, lat. apic. 62— 73, lat, lob. pol. 

 24—27 ju. 



Grunow gives long. 133, lat. 115, lat. apic. 75, lat. lob. pol. 20 — 22 ,«. 



