SHORT NOTES 235 



Hydrilla verticillata Casp. [We take the following from the 

 recent Report of the Watson Exchange Club, which is noticed on 

 p. 238. The plant was "first discovered [in Esthwaite Water, 

 N. Lancashire] in 1914, and is now more abundant than formerly."] 



" Grows with JSfaias flex His, Pot. ■panormitanvs, P. Sturrockii, 

 Callitriche autumnalis, etc., at a depth of six to eight feet, invisible 

 from the surface, under a light-intensity of "05 to "03 of full daylight. 

 Light does not entirely control its distribution however, for it is only 

 found where the mud is inorganic, blue-grey in colour and clayey in 

 texture, and containing less than 15 per cent, of organic matter. It 

 propagates itself here solely by means of winter buds ; no flowers 

 have been seen, although carefully sought for for six years. The 

 nearest place where it is known to occur is in Pomerania, 700 miles 

 due east. It is conceivable that ducks, driven westward by the 

 colder winters of that country, alighted on this private and secluded 

 water with winter-buds adhering to their feathers or feet. This is 

 supported by the fact that the extensive reed-swamps on the lake- 

 margin still shelter great numbers of wild fowl of many species. 

 The lake drains into Windermere, less than two miles distant ; but so 

 far we have not been able to find the plant there. This however, is 

 not surprising, for the conditions under which plants live in the two 

 lakes are very dissimilar. Plants on the lake-floor in Esthwaite are 

 invisible at four feet, but easily recognised in Windermere at twelve 

 feet (and objects of light colour up to twenty feet), while the 

 quantity of silt in the former is much greater than in the latter, and 

 essentially different in character. (See Journ. Ecol., Dec. 1917.)" — 

 W. H. Pears all. 



CtLOSTERSHIRE Plants. I have recently had nice specimens of 

 Trifolium subterraneum sent me from near Tewkesbury with 

 T. Jtliforme ; the only previous record which I have from v.c. 33 is 

 from a garden near Cheltenham : probably a lawn plant. Cardamine 

 impatiens is also found in the Tewkesbuiy neighbourhood. From 

 several places, both in v.c. 33 and in v.c. 34, an Orobanche has been 

 sent which agrees well with O. minor var. Jlavescens in its colour. 

 It has the minor tube and stigma, and is highly glandular, not with 

 the jointed glandular hairs of some species but with simple rigid 

 hairs tipped with yellow glands. In all cases (in Glos.) it has been 

 found along with ordinary minor. Car ex foment osa has been found 

 in Hailey Wood, Cirencester, in very small quantity with C. palles- 

 cens : also in a dry field between Barnsley and Bibury.- — H. J. 



RlDBELSDELL. 



Srarg.axium angusttfoltttm Michx. In a recent letter Mr. M. 

 L. Fernald, of the Cray Herbarium, Mass., U.S.A., writes : " There is 

 no possible question that Michaux's plant is the same as Sparganium 

 affiae Sehnizl. I examined the material at Paris in 1903, and there 

 is no doubt about the matter." In 185] Babington (Man. Brit. Bot. 

 ed. 3, 338) first mentions S. affine under S. nutans L. with a reference 

 to Fries, Sum. Veg. Seand. 559 (supp.) (1846). In the same year 

 Svme (Bot. Gaz. iii. 157), under S'. natans " L." Fries, says that Don 

 iu the herbarium of Dr. Fleming (ISOS) named the plant S. longifolium 



