M'Nab — A Revision of the Species of Ahics. 691 



iact that this species has the shoots either hairy or smooth, both iu 

 young and old plants. 



Bertrand {loc. cit. p. 89) says that Pindrowhas " Tres-peu d'hypo- 

 ■derma;" this I have only found in exceedingly young leaves, all 

 others examined by me having abundance of hypoderm. He seems 

 to have confused the species from the Himalayas, because he says, 

 p. 91, "A. Webbiana, Lind., ne difEere pas anatomiquement de I'A. 

 Pindrow, Spach," in which statement I cannot concur. 



16. Pitius {Abies) Welhiana, "Wall, MSS. ; Parlatore, D. C. Prod. xvi. 

 pars 2, p. 425, No. 100. Pinus spectabilis, Lamb., Pin. ed. 2, 

 vol. 2, p. 3, t. 2. Abies Wehhiana, Spach. Picea Webliana, 

 Loudon, Arb. Brit. iv. p. 2346. • 



Shoots hairy or smooth. Leaves inserted singly all round the 

 stem, but directed chiefly towards the two sides, those on the upper 

 side with their points directed towards the apex of the shoot, and 

 nearly parallel to its axis. Leaf long, linear, twisted more or less 

 according to its position on the shoot, base narrowed towards the 

 ■orbicular insertion. Breadth of leaf uniform through most of its 

 length, slightly contracted near the bifid apex, the two portions being 

 small and very sharp, or slightly rounded ; upper surface dark green, 

 with no stomata, beneath with a band of stomata on each side of the 

 midrib, there being from 8 to 10 rows in each band. Leaves from 

 1 to 2+ inches long, and about iV iiich wide. Buds brownish and 

 resinous. 



Transverse section of leaf. — Leaf about four times as broad as thick, 

 sides with a well-marked lateral line, upper surface convex, with a 

 well-marked longitudinal furrow, below with a slightly prominent 

 midrib. Hypoderma rather well developed, forming an interrupted 

 band running from the resin-canal of one side, under epidermis of 

 upper surface, to the resin-canal of the other side ; the hypoderm is 

 also developed under the epidermis of the slightly prominent midrib. 

 The resin-canals are placed, one at each side of the leaf, close to the 

 ■epidermis of the under surface. The pallisade tissue is well developed 

 on the upper side, and below is the parenchyma with well-marked 

 intercellular spaces communicating with the stomata. 



Pibro-vascular bundle double, with thick cells above and below, 

 the whole surrounded by a well-marked sheath. 



The figure (Plate 48, fig. 18) is drawn from a specimen cultivated 

 at Glasnevin Garden, and kindly supplied to me by Dr. Moore. 



This species, like A. Pindrow, has the shoots either glabrous or 

 hairy when young or old, and I am again indebted to Mr. Syme, of 

 Elvaston, for specimens showing this. In young plants the hypoderm 

 is only very feebly developed, but the form of the section of the leaf 

 at once separates it from Pindrow. 



Mr. Syme sent a specimen under the name of Picea Webbiana 

 •ovata, which I cannot separate anatomically from the type. 



There is a specimen in the Museum, Royal Botanic Garden, Edin- 



