158 



CENSUS OP DESMIDS OP A TRIASSIO DISTRICT. 



V.C. = Very Common. C. = Common. 



P. = Frequent. R. = Rare. V.R. = Very Rare. 



260. C. ochthodes Nordst . . 



261. C. ochthodes var. amoebum (W 



and 0. S. West 



262. C. oblongum Benn. (60,u X 30m) 



263. C. ornatum Ralfs. 



264. C. Palangula Breh. . . . 



265. C. pachydermum Lund. . 



266. C. parvulum Breb. 



267. C. plicatum Beinsch. var. Hiberni 



cum West ... 



268. C. praemorsum Breb, . 



269. C. promiimlura Racib. var. subun 



dtilatum West 



270. C. perpusillum West . 



271. C. Portianum Arch. 



272. C. pvinctulatum Breb. . . 



273. C. punctulatum var, sub-pimctula 



turn Borges 



274. C. pusillum (Breb.) Arch. 



275. C. pseudopyramidatum Lund. 



276. C. pseudopyramidatum var. steno 



notum Nordst. 



277. C. pseudocomiatum Nordst. . 



278. C. pseudoexiguum Racib. , . 



279. C. pseudarctoum Nordst. (zygo 



spore) . 



280. C. pygmaeum Arch, (zygospore) 



281. C. pyramidatum Breb. . 



282. C. pyramidatum var. angustatvim 



West .... 



283. C. praegrande Lund. 



284. C. Phaseolus Breb. var. elevatum 



Nordst. (21,a X 21/x) 



285. C. Phaseolus forma minor Boldt 



286. C. plicatum Reinsch. var. hiberni 



cum West . . . 



287. C. quadrimamillatum W. and G. S 



West .... 



288. C. quadratum Ralfs 



289. C. quadratum var. angustatum W 



and G. S. West 



290. C. quadrifarium Lund. . 



291. C. quadratulum (Gay) De Toni 



292. C. Ralfsii Breb. . . 



293. C. Ralfsii var. montanum Racib 



294. C. reniforme (Ralfs) Arch. 



295. C, reniforme var, compressum 



Nordst. . . . 



296. C. rectangulare Grun. . 



