82 Proceedings of the Royal Society of Edinburgh. [Sess. 



Juncus conglomeratus, L. " I., III.," IV., V., VI., VII. On dryer ground 

 than J. effusus, and veiy much less abundant. 



Juncus glaucus, Ehrh. ( = -/. inflexus, L.). VII. Not uncommon in 

 some of the other Areas, but I have only observed it on the shores of 

 lochs in Area VII. 



Juncus bufonius, L. "I.," IV., VI., VII. Frequent about the shores of 

 many lowland lochs, but less common at the hills. Its var. fasci- 

 culatus, Bert., is sometimes found growing in dense prostrate tufts on 

 exposed sandy shores. 



Juncus lamprocarpus, Ehrh. ( = «/. articulatus, L.). I., IL, III.," IV., 

 v., VI., VII. Abundant on the shores of lochs, especially where 

 the water is more or less peaty. 



Juncus acutiflorus, Ehrh.{ = J. sylvaticus, Reichb.). "I., II., III.," IV., 

 v., VI., VII. Abundant on the shores of lochs, but it is perhaps more 

 plentiful about the non-peaty lowland lochs than J. lamprocarpus. 



When, as sometimes happens, it could not be readily determined 

 to which of the last two species a specimen was referable, I have 

 called the plant J. articulatus, with the old aggregate meaning. They 

 both vary greatly, but I think most of the reduced forms so fre- 

 quently met with are from the acutiflorus group (figs. 18, 51. etc.). 



Juncus supinus, Moench { = J. bulbosus, L.) " I.," IV., V., VI., VII. A 

 more protean species than the last mentioned. In a former contri- 

 bution {ante, p. 976), I gave some descriptive matter regarding the 

 forms of this plant ; all of these variations occur also in the Areas 

 now under consideration. In the districts now being discussed, the 

 terrestrial forms are more abundant than in the Ness Area, whilst 

 the aquatic form var. fluitans (Juncus fluitans, Lam.) is less 

 abundant than in the Ness Area. The last-mentioned form, however, 

 is plentiful in many of the peaty lochs of Areas IV. and VI., but in 

 V. and VII. it is scarce. 



TYPHACE^. 



Typha latifolia, L. "III.," V., VL, VII. Chiefly on the shores of 

 lowland lochs, but not common, nor is it often abundant (figs. 73 

 and 74). The only place at which I have ever seen this plant in a 

 peat}^ lochan on an exposed peat moor is at L. Wayoch, Drumdow 

 Moss, Wigtownshire. The appearance of this and other plants such 

 as Eupatorium cannabinum, in the midst of so peaty an area as the 

 Moclirum district, seems to indicate the presence of some agent {e.g. 

 calcium or potassium) counteracting the influence of the humic acids 



