POTAMOGETON PRELONGUS IN BRITAIN 165 
BrBLioGRAPHy 
1. De Bary, H. A.: Beitr. zur Morphol und Physiol. der Pilze: 
§ 4 lag Erysiphe, 884, 899 — 71). 
E.8.: A onograph of the Erysiphacee (Mem. 
cade rea jt. Ca, ix., 18, 19, 61, 62 (1900) ). ee 
upplementary N otes on the Erysiphacee (Bull. T 
Bot. Cla pri ge 18 (1902) ). ee ( es 
: Beitrage zur Biologie der Erysipheen (Flora, 
XC., 349-567, 270 (902) 
archal, E.: De la spécialisation du parasitisme chez 
) Erysiphe Graminis (Comptes Rendus, exxxv., 210-212 (1902) ). 
arper, R. A.: Ueber das Verhalten der me hn bei der 
Smith, Worthingtén G.: Diseases of Field and Garden Crops, 
138 “ass 4). 
i) -: Beitrag zur Kenntniss der Schmarotzerpilze 
(Erysiphe Graminis und FE. communis), 36 (1875). 
(To be concluded.) 
POTAMOGETON PRALONGUS Wuotr. IN BRITAIN. 
By Arruur Bennett, F.L.S. 
Tus species was a published as a British plant in Hooker’s 
British Flora, ed. 3, 77 (1835); but it had been gathered many 
years before, and shel as lucens. ee age ns from Moray in the 
Brodie Herbarium dated back ne before 1820 (see A. Murray, 
Northern ney 108, 1836). It w seat determined from speci- 
mens gathered by J. = hy ee sent it to W. A. Stables, by 
whom it was Barge to G. A. Walker-Arnott, who named it in 
1833 (see Phytologist, i i. will 1842). It had also been gathered in 
Cromar, Aber mi shire, mene ‘* several years before, and 
shown by him 5 ke. J. pes erson 
grounds ”’ Ge. e, 500 ft. 0 r below), ur he records it in the Cybele as 
gathered in Yorkshire ‘i ‘about 1200 ft.” Since 1869 many new 
records and altitudes have been published, of ge the following 
is a selection :—Argyle, 607, Macvicar, sp. ; 1250 ft., J. 
Windsor in herb. C. Bailey !; Westmoreland, 1550 ‘ft, a ae re 
. : and 
Dickie, Bot. Guide, 177 (1860); Perth, Mid., 2500 ft., Macvicar, 
sp.; 2500-3000 ft., Messrs. Dixon and oi * Pool near summit 
_ ca :—I Sy ae M an Tarmachan (3421 ft. 
according to Mr unro) is intended tas oe Mount. Club 
Journal, 282 (1891), tra ft. in Highland Is la to 1900 ft. in 
, Buchanan erth.” The authors of the Cybele 
Hibernica, ed. 2, 377 a8), say ‘‘ Lowland.” 
