EEPOET OF THE BOTANICAL EXCHANGE CLUB. 285 



Diithie sweet-tasted. M. Grenier considers that Sorbus Mougeoti of 

 Soyer and Godron is " a xerophilous form of scandica,^^ There is no 

 doubt that it is nearer to scandica than to latifolia, and seems to replace 

 P. scandica on the Continent of Europe. It differs in having the 

 leaves whiter beneath, and the fruit smaller. It seems to me to be 

 between P. scandica and P. eu-aria. I have no foreign specimens of 

 true P. scandica, except from Sweden and some received from the 

 late Herr Buck, collected *'prope Gelanum " — i.e., Dantzig. In 

 Prof. Keichenbach's collection there are four examples of P. scandica, 

 all from Sweden, but none of P. Mougeoti. 



5. Pyrusfennica. At the time when I arrived at the conclusion that 

 Mr. Craig-Christie's Arran Pyrus was P. scandica, and distinct from 

 the English plant so called, I drifted into another error — that all the 

 Pyrus of the Aria group found in Arran ought to be referred to P. 

 scandica, supposing that the Arran Pyrus with the leaves pinnate at 

 the base was a plant described by Eries as P. scandica, var. pitmatifida. 

 At that time I had seen very few, and these few imperfect, specimens 

 from Arran, and possessed but a single Scandinavian specimen from 

 the late Dr. Blytt. Having, however, obtained good specimens of 

 P.fennica collected by Dr. Ahlberg, of Upsal, some of which agreed well 

 with Mr. Duthie's specimens of Pyrus from Glen Catacol, I began to 

 think that the supposed P. scandica 'pinnatifida from Arran must be 

 P. fennica, and in order to resolve my doubts I made an excursion to 

 Arran in the first week of June, 1872, and found both partially 

 pinnate and the non-pinnate forms of Pyrus. As soon as I saw the 

 plants growing I was convinced that the non-pinnate and abundant 

 plant was true scandica, and the scarce form with leaves pinnate at 

 the base was \jY\i.^ fennica . P. fennica differs from scandica in having 

 all the vigorous leaves with from 1 to 4 pairs of the lowest lobes 

 separated quite down to the midrib, and the succeeding pair, or even 

 two pairs, nearly so. Erom each pair of separated pinnae above the 

 first there is a decurrent stripe on each side of the midrib, broadest at 

 the point where it leaves the upper pinna, and decreasing in width till 

 it vanishes at the origin of the pinnae beneath it. The first pair of 

 pinnae is almost always as long as and no broader than the succeeding 

 pairs on the adjacent unseparated lobes if there be but one pair of 

 pinnae. The part of the leaf which is not cut into separate pinnae 

 is ovate or rhombic-deltoid or triangular towards the apex, with lobes 

 decreasing in size towards the apex. The separated pinnae are oblong- 

 oval or elliptical, usually remotely and coarsely serrate on both margins, 

 often appearing acute from the prominence of the terminal tooth into 

 which its partial midrib runs, but when this tooth is smaller than 

 ordinary the outline appears rounded. The lowest of the lobes which 

 are not separated so far as they are free resemble the pinnae. The 

 succeeding ones, which are much shallower, are usually more acute 

 towards the apex ; besides, the main veins which run into the pinnae, 

 or the extremity of the lobes, vary from 6 to 10 on each side, but 

 besides these there are often intermediate lateral veins which run into 

 the sinus between two lobes, so that the number of lateral veins is often 

 much greater than that of the lobes. The upper surface of the leaf 

 even in its young state has not a distinct flocculent covering, but has 

 arachnoid hairs, especially along the veins, as in P. Aucuparta. The 



