38 W. B. TURNER, FRESII-WATER ALGJE OF EAST INDIA. 



1 have oraitted to give ful] figure of this, ;is I formerly imagined it was the 

 same as I). rotundatum, supra, but on niore carefully considering Wallichs figure 

 I ain convinced that they are distinot; Dr. W. expressly says »Frond smooth» — and 

 it differa in various details from the preceding forms. 



Notwithstanding Dr. Wallich's remarks as to the absence of »locelli» at the apiees 

 of this species, it is reasonable to suppose, by analogy, that they exist. Maskell 

 (Desm. N. Z. p. 310) says that they exist in D. ovatum Nokdst. (= D. dilatatum ejus, 

 non Cleve), and that is a cognate form. 



47. D. (lenticulatum, Grunow (Desm. u. Diat. Insel Bänka, p. 13, t. II, f. 19). 



Long. 270—310, lat. bas. 20—25, lat. apie. 17—19 ,«. 



East India, from Utricularia fasciculata; Himalayan Distriet, ex Utr. stellari, 

 coram. G. von L. 



These plants accord well with Ghunow's descr. and fig., except that they only 

 have 8 minute tubercles at the apiees. 



48. D. coromilatum, GrRUN. (1. c, p. 14, t. II, f. 20). 



Long. 486—508, lat, max. 46—49 //. 

 East India, ut sp. pra^cedente, G. v. L. 



49. D. baculnm, Bréb. (Closterium haculum, Alg. Fal. p. 59, t. 8, 1835; D. baculum Bréb. 

 in Ralfs' Br. Desm. p. 158, t. XXXIII, f. 5; Cl. trabeculoides ("oroa Obs. t. 6, f. 44, 

 1840; Pleurotcenium baculum, auct. nonnull.). 



Long. 180—220 ,«, lat. centr. semic. 11 — 13.5 /'. 



This was noted from Burmah by Drs. Zeller and Rabexiiorst, S. Kurz legit, 

 1873; it occurs tioav from K. Bengal, ex Utricularia flexuosa, ooraui. G. von L. 



50. D. trabecula, Eiir. {Closterium trabecula, Ehr. Abhl. Berl. Ak. 1831, p. 68 sec Lun- 

 dell; Infus. p. 93, t, VI, f. II, 4, 7; Docidium trabecula Wolle, Desm. U. S. Amer. 

 p. 48, t. XII, f. 1 — 3; Pleurotamium trabecula auct. nonnull.); /". typica. 



Long. 380—460, lat. 22—31 ". 

 East India, ex Utricularia fasciculata, G. von L. 



This is deeidedly a »critical species», as until recently it has been synonymized 

 along with Ralfs' form D. Ehrenbergii. Cfr No. 23. Consensus of opinion seems to 

 have accepted a form with more or less swollen sides, and truncato-rotund not den- 

 tate nor crenate apiees, as the true one. Ehrenberg's species is a multifarious' one; 

 the figs. given in Infus. t. VI, f. II apparently resolve themselves into: 

 Fig. 1 = Doc truneatum Bréb. 

 » 2, 5 = D. clavatum Kutz.? 



» 3? 6 = D. nodnlosum Bréb.? (3. D. crenulatum?). 

 » 4, 7 = D. trabecula genuina? 

 » 8 =D. Ehrenbergii Ralfs? 

 See the figures of Wolle, 1. c; West, in Journ. R. Mic. Soc. t. II, t. 1 1 , 1889; 

 and of /y crassum Wittr. Got, Öl. Sötv. Alg. t. IV, f. 17, 1872. 



51. D. rectum, Delp. (Pleurotamium rectum, Desm. Subalp. p. 225, t. XX, f. 8 — 11, 1877; 

 Valium rectum, WTlle Sydamer. Algfl. p. 22, 1883. 



Long. 240—259, lat. bas. 16.5, lat. 13—15 ,«. 



