196 THE JOURNAL OF BOTANY 



with plenty of drainage for the roots, exactly suit its requirements. 

 The mineral railway habitat is particularly suggestive ; there is 

 no trace of any former cultivation, and the ballast consists of the 

 surrounding granite rock. On the same track, but lower down 

 (at about 300 ft.), I found a plant or two of Potentilla Sibbaldi, 

 also seen at 700 ft. or less, near Socach farmhouse; this is 

 abundant on the mountain-tops. In one case the occurrence is 

 clearly a case of "seeding down "; why should not the same thing 

 have happened in the other ? It should be borne in mind, more- 

 over, that the first record of J. tenuis as British in English Botany, 

 2174 (1810), states that it (' J", gracilis') was "found by Mr. 

 G. Don in 1795 or 1796 by the side of a rivulet in marshy ground 

 among the mountains of Angus-shire." Mr. E. A. Phillips, in a 

 letter received last August, says : " Sisyrinchium angustifolium 

 and Juncus tenuis are, I firmly believe, both native in Ireland." 



SiMrganium affine Schnizl. Pools near Loch Awe. 



S. mininmm Fr. Ditch in Strath Orchy, about a mile and a 

 half below Dalmally. 



Potamogeton natans L. ; P. heterophyllus Schreb. Plentiful in 

 the lower part of the Lusragan Burn, Connel Ferry. 



^Scirjms fluitans L. Ditches in the lower part of Strath Orchy. 



Eriophorum latifolium Hoppe. Base of Meall nan Tigearn, 

 at 1500 ft. 



Carex pauciflora Lightf. was only seen low down on Ben 

 Eunaich, but is easily overlooked. 



C. canescens L. {cicrta Good.). Near the Lusragan Burn, and 

 in Strath Orchy. 



C. aquatilis Wahl. 88. The slender plant so plentiful in the 

 bog between Ben More and Am Binnein is exactly Kiikenthal's 

 former angustata. Associated in good quantity with this and 

 G. Goodenoivii is a sterile sedge, looking intermediate in size and 

 general habit, which I believed to be aquatilis x Goodenoioii, 

 though the short spikelets and the female glumes point rather 

 towards '■■-Goodenowii x rigida. I did not see G. rigida in this 

 station; but its pollen, wind-borne from the surrounding heights, 

 could easily fertilize G. Goodenoioii. Mr. Dixon {in litt.) asks 

 where I can see traces of G. aquatilis, and his doubt is very 

 reasonable ; in fact, after careful comparison with my good series 

 of both hybrids, I find that it (no. 3474) is exactly the same as my 

 no. 2760 from Clova (July, 1904), which Kiikenthal confirmed as 

 G. aquatilis x rigida, "tending more towards C. Goodenowii." 



G. capillaris L. Meall nan Tigearn. 



G. lasiocarpa Ehrh. {filiformis auct.). Plentiful in the Black 

 Loch, an old lake-bed opening out from the Lusragan Burn, and 

 now forming a deep reed-swamp. 



G. acutiformis Ehrh. [paludosa Good.). Lusragan Burn, two 

 and a half miles from Connel Ferry, growing for about fifteen 

 yards on dryish peat ; a peculiar form or rather state, the leaves 

 being less glaucous above and of a yellower green than I have 

 seen elsewhere. 



G, inflata x vesicaria. Frequent and variable, between Dal- 



