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habitat preference between the two may be useful in distinguishing 

 them in the field. Unlike P. pumila, which shows a partiality for 

 moist, shaded woods and is not, as a rule, conspicuously gregarious, 

 P. fonfana is usually found in a boggy or marshy environment, fre- 

 quently in the open where it may form extensive carpets simulat- 

 ing a mat of seedlings of the coarser P. pumila. The collections of 

 P. fontana seen by the writer are cited below, in the interest of stu- 

 dents of local floristics to whom its known range may be indicative 

 of the possibility of detecting it in their areas. 



Prince Edward Island : Larch swamp, Dundee, Kings Co., Aug. 

 26, 1912, Fernald, Long and St. John, no. 7324 (US). New York: 

 Ithaca, Sept. 11, 1875, without collector (US); Bridgehampton, 

 Long Island, Aug. 12, 1925, W. C. Ferguson, no. 4788 (NY). New- 

 Jersey: Wet woods in Eagle Rock, Essex Co., Oct. 1, 1905, K. K. 

 Mackenzie, no. 1869 (NY) ; West Englewood, Bergen Co., Sept. 

 15, 1917, P. Wilson (NY). Virginia: Abundant in wet land, Glen- 

 carlyn, Arlington Co., Oct. 6, 1894, L. H. Dezvey, no. 162 (US) ; 

 wet swale west of Edinburgh near Columbia Furnace, Shenandoah 

 Co., Aug. 14, 1938, H. A. Allard, no. 5459 (US) ; low ground near 

 Jones Mill Pond, Williamsburg, James Co., Sept. 20, 1921, E. J. 

 Grimes, no. 4409 (NY). Marsh near Longshol, Montgomery Co., 

 June 23, 1940, F. J. Hermann, no. 10665 (US). Florida: Near 

 Jacksonville, Duval Co., Oct. 29, 1894, A. H. Curtis, no. 5349 

 (NY; US). Ontario: Amherst Islands, Aug. 15, 1890, /. Fowler 

 (US). Michigan: Open marshy bank of Huron River 2 miles east 

 of Ann Arbor, Washtenaw Co., Sept. 22, 1935, F. J. Hermann no. 

 7341 (Plantae Exsiccatae Grayanae, no. 650) (NY; US) ; marshy 

 border of lake, 2 miles west of Cambridge, Lenawee Co., Oct. 1, 

 1936, F. J. Hermann, no. 8408 (NY) ; marsh bordering stream, 1 

 mile east of Trist, Jackson Co., Sept. 18, 1937, F. J. Hermann, no. 

 9297 (NY). Indiana: Abundant in decadent tamarack bog, 5 miles 

 east of Lagrange, Lagrange Co., Sept. 20, 1936, C. C. Deam, no. 

 57418 (US). Wisconsin: Green Bay,Brown Co., Sept. 17, 1891, 

 /. H. Schuette (NY). Minnesota-: Moist meadows, Winona, Winona 

 Co., June 1886, /. M. Holsingcr (NY; US) ; shore of Morrison 

 Lake, Itasca Park, Clearwater Co., Sept. 6, 1929, M. L. Grant, no. 

 3285 (NY; US). North Dakota: In a thoroughly shaded cold bog 

 along a rill. Pleasant Lake, Benson Co., Aug. 14, 1911, and July 3, 



