50 ECOLOGY, PLANT GEOGRAPHY [Bot. Absts., Vol. IV, 



327. Domin, K. Dritte Dekade neuer Adventivpfianzen aus Bohmen. [Third decade of 

 new adventive plants from Bohemia.] Oesterreich. Bot. Zeitschr. 67: 264-267. 1918. 



328. Dtjfrexoy, J. Diversite ecologiqueet coefficients gSneriques. [Ecological difference 

 and generic coefficients.] Bull. Trimest. Soc. Mycolog. France 35: 27-46. 1919. — The author 

 states that the number of genera and the number of species of parasitic fungi within a cer- 

 tain region depends upon ecological conditions. In order to show this, the author selected 

 (1) a region having great ecological variations (the Valley of Bareges) and (2) several places 

 of more or less uniform character (a grain field, sand hills near the ocean, etc.). In the first 

 mentioned region he observed 11 genera of rusts represented by 52 species, 26 genera of other 

 fungi represented by 40 species, and 3 genera of parasitic bacteria represented by 7 species, 

 giving the following generic coefficients: rusts = 20 per cent, fungi in general = 40 per cent. 

 On the other hand in places of small ecological difference the author found in one place 8 genera 

 of fungi represented by 10 species = 80 per cent. In other places he found 3 genera repre- 

 sented by 3 species = 100 per cent; 10 genera represented by 11 species = 90 per cent; and 

 11 genera represented by 12 species = 90 per cent. This shows that generic coefficients among 

 parasitic cryptogams as well as among phanerogams depend upon ecological differences. — 

 Fred C. Werkenthin. 



329. Fernald, M. L., R. C. Bean, and C. H. Knowlton. Field trips of the New England 

 Botanical Club, 1919. Rhodora 21: 143. 1919. — A report, by the Committee on Field Excur- 

 sions, of the field trip of the club, May 29-31, into the Berkshire region with a center at Pitts- 

 field, Mass. Typical sections of nine townships were explored and about 500 specimens were 

 collected; many of them were previously known from only one or two stations in the state, 

 among them Salix serissima conspicuously in flower. At least eight plants new to the state 

 were collected. Plans for a Labor Day trip to the ponds and bogs of western Rhode Island 

 and adjacent eastern Connecticut are also discussed. — James P. Poole. 



330. Ferris, Roxana Stinchfield. A new plant record for California. Bull. Southern 

 California Acad. Sci. 18: 13. 1919. — Holacantha emoryi is recorded from California. — L. R. 

 Abrams. 



331. Flynn, (Mrs.) Nellie F. Field meeting of the Vermont Botanical Club. Rhodora 

 21: 191-192. Oct., 1919. A short account of the annual field meeting of the club at North 

 Hero on Lake Champlain, August 5-6, 1919. Followed by similar accounts of the meetings of 

 1917 and 1918— James P. Poole. 



332. Frodin, John. Nagra vaxtlokaler mellan Kebnekaise och norska gransen [Some 

 plant-localities between Kebnekaise [a mountain in northern Sweden, lat. 67° N.] and the Nor- 

 wegian boundary]. Bot. Notiser 1918: 211-213. 1918. The localities of 62 arctic-alpine 

 species are given. — P. A. Rydberg. 



333. Garland, L. V. Lester. New county records for Argyle [Scotland]. Jour. Botany 

 57:322 1919. — This is a list of new finds in Argyle during a visit there in September. — 

 K. M. Wiegand. 



334. Gertz, Otto. Nagra aldre litteraturuppgifter om Vaccinium vitis idaea L. f. leuco- 

 carpa Aschs. et Magn. [Some old reports on Vaccinium vitis idaea L. f. leucocarpa Aschs. and 

 Magn.] Svensk. Bot. Tidskr. [Stockholm] 13: 109-110. 1919.— Author gives the three known 

 localities in Sweden where the white whortleberry has been found and a brief resum6 of the 

 literature relating to their discovery. — W. W. Gilbert. 



335. Harper, Roland M. An interesting peat bog in New York City. Jour. Amer. Peat 

 Soc. 11: 8-11. IS fig. Jan., 1918. — A bog of interest, partly because of its urban position, and 

 partly because of the abundance of Decodon. It is for many miles the only station of Chamae- 

 daphnc and Sagittaria Engelmanniana. — II. C. Caul s. 



