152 w. i?, ri i;x i-.k, frenii-water ALGM OF kast india. 



sum, Bréb. Alg. Fal. p. 65, t. II, 1835; Mejtégh. Synöps. p. 204, ex. p., 1840; Ralps 

 in Annals vol. XI, p. />74, t. VIII, f. 2. 1843; Desmidium limbatum, Chauv. Alg. 

 Norm. f. 6, 1836, sec. Mexgh.; Glceoprium dissili&ns, Bérkeley in Annals v. XVI, p. 

 11, 1845; Hyalotheca mumsa, Iutz. Phye. Germ. p. 140, 1845; Sp. Alg. p. 187, 

 1849). Formae varise? Wallich Mscr. No. 52. 



Long. 13 — 3^>, lat, 17—39 ,u. G. 0. \Y. 1. c. 



The dimensions of the larger cells, as given by Wallich, appear verv great, but 

 lic is a verv careful observer and hence probably correct. In the figure cited the 

 sides of the cells are very faintly inenrved. 



Raneegunge; July, Oct. 1855. 



[//. dissilims v. tridentula Nordst. (Norg. Desm. p. 48, f. 23) is noted by Roy 

 in Dkkiks Alga? from the Himalayas.] 



H. miicosa (Mert.) Ehrb.? (Kurze Nacht.? 1840, sec. Ralfs; Ralfs Br. Desm. p. 53, 

 t. I, f. 2, 1848; Conferva mucom Mertexs. Dillw. Br. Confervse t. B, 1809; Glceo- 

 prium mucosum, Ralfs Annals. v. XVI, p. 11, t. III, f. 6, 1845; Hass. Br. Fr. Alg. 

 p. 346, t. 83, f. 5, 1845; Hyalotheca Mertensii Bréb. in litt. ad Kalks, 1846; Hyal. 

 Ralfsii, Kutz. Sp. Alg. p. 187, 1849; Desmidium mucosicm ex. p. Mengh. Synops. p. 

 204, 1840; Desm. limbatum, var. mucosum Chauv. 1. c.; Mixolcenium <tvmillari\X)TA.v- 

 Desm. Sub-alp. v. 50, t. I, f. 13 — 19, 1873). 



a. Long. 15—17, lat. 20—21 ,«. 

 Northern India. 



b. Long. 13—18, lat. 10 — 12 //; sec. Wallich Mscr. No. 47. 



The latter might stånd as var. fi elongata? The deseription and the sketch show 

 the normal filament, bnt of small size and elongated. 



Raneegunge. 

 H. undulata Nordst. (in Wittr. et Nordst. Alg. Exsic. No. 248, &c, 1879?) var. 

 producta, n. var. II. parvå, cellulae circ. dnplo longiores quam lata?, cylindrica?, sine 

 ])rocessnbns intercellnlaribus; medio leniter constriétae, apicibus rotnndato-plamv; cellulae 

 nonnullre cniii incisnris parvis a latere (divisione incipiente?); corpuscula amylacea dua 

 in quaque cellula; membrana glabra; filis elongatis. Tubus mncosns non observatns 

 est. A vertice visa eirculafis? Sec. G. C. W. Mscr. No. 61. 



Long. 15—16.2, lat. 6.5—8.7, lat, apic. 4—5.7 // tide G. C. W. 1. c. T. XVIII, 

 f. 15, X circ. 700. 



This seems very near to //. undulata Nordst. (W. & N. Alg. 24S. 262, 561 et 

 806), but I have not seen this plant. The Indian form is longer and of less diameter 

 than the American ene of Wolle, Desm. U. S. Amer., p. 23, t. LIII, f. 8, of which 

 he gives the lat. as !> — 12 ,«. 



H. Intlica. n. sj). II. parva, cellulae paullo longiores quam lata': cylindrica', medio 

 sub-acnte incisae, ineisnra celhilam circmnambiente: fila elongata. Nuclei cellnlarnni 

 duo, radiati. Tubus mncosns latus. Forma': 



a. minor. Long. 10 — 15, lat. 9 — 11, lat. apic. 7 ,'/. WalliCÖ Mscr. No. 51. T. 

 XXII, f. 17. 



b. major. Long. 13 — 15. lat; 16. lat. apic 11—1:1 «. T. XIX. f. IS. 



