M'Nab — A Revision of the Species of Abies. 693 



18. Pimis (Alies) pectinata, Lam. Fl. Frang., ii., 202(1778). Pinus 

 Abies, Duroi, Obs. Bot., p. 39 ; Parlatore, D.C. Prod. vol. xvi. 

 p. 420, No. 92 (in part). Finus Picea, Linn. Sp. Plant, ii., 1001 

 (1753). Alies Picea, Koch, Dendrologie, vol. ii., pt. ii., p. 217. 



Shoots hairy. Leaves inserted singly all round the stem, the lower 

 ones bent to form two lateral rows, those on the upper side more or 

 less spreading, and bent at the base so as to bring the superior sur- 

 face upwards, the inferior surface being next the axis. Leaf linear, 

 more or less twisted above the base according to the position on the 

 stem, apex rounded or emarginate, upper surface shining dark green 

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

 slightly prominent midrib, there being 7 or 8 rows of stomata in 

 each band. Leaves about f to 1 inch in length, and xif inch wide. 

 Buds covered with slightly resinous brown scales. 



Transverse section of leaf. — Leaf flattened, about 24- times 

 broader than thick, sides rounded, the leaf becoming markedly 

 thinner towards the margins, upper surface with a longitudinal 

 furrow, below with a slightly prominent midrib. Hypoderma well 

 developed, a slightly interrupted row of cells running from near the 

 resin-canal of one side to near the resin-canal of the other side. The 

 hypoderm is also developed below the epidermis of the midrib. Resin- 

 canals placed, one on each side of the leaf in the parenchyma, and se- 

 parated from the lower epidermis by layers of chlorophyll-bearing 

 cells. Pallisade tissue well developed on upper side, the parenchyma 

 below with intercellular spaces communicating with the stomata. 



Fibro-vascular bundle double, the parts placed rather close together, 

 the whole surrounded by a sheath. 



The figure (Plate 48, fig. 20) is drawn from a specimen from Glas- 

 ncvin Garden, kindly given to me by Dr. Moore. 



Bertrand (o/j. cit. p. 90) places A. pectinata in the group with the 

 resin-canals touching the lower epidermis, and adds that Nordman- 

 niana appears to be little different from A. pectinata. All the spe- 

 cimens of A. pectinata that I have examined have the resin-canals in 

 the parenchyma of the leaf, so that I conclude that the A. pectinata 

 examined by Bertrand was a variety of A. Nordmanniana. 



All the specimens examined by me have the resin-canals in the 

 parenchyma of the leaf, and have the hypoderm well developed ; the 

 ([uantity of hypoderm varies, and is least developed in the plant grow- 

 ing in the Botanic Garden, Glasnevin. This very interesting tree was 

 raised from seed by Dr. Moore, the seed having been received from 

 the Himalayas, and transmitted to Dr. Moore by the East India Com- 

 pany. The leaves of this plant are wider, and have a sharper or less 

 rounded margin than the typical form ; and this, taken along with the 

 feebler development of the hypoderm, might warrant the separation of 

 the plant under the name of variety Mooreana. (PI. 48, fig. 21). 



The leaves from a cone-bearing shoot in the Museum, Eoyal Bo- 

 tanic Garden, Edinburgh, were examined, and found to have a more 

 tetragonal form, there being no longitudinal furrow visible. The 



