700 Proceedings of the Royal Irish Academy. 



resin-canals are two in number, placed close to the nnder side of tlie 

 leaf, and generally about half-way between the midrib and the margin 

 of the leaf, a small cluster of hypoderm cells often placed below the 

 resin-canal. Between the midrib and the resin-canal, on each side, 

 inferiorly, the stomata are developed and the hypoderma is wanting. 

 Between the resin-canal and the margin of the leaf the hypoderma is 

 either continuous or interrupted by the presence of a few stomata. The 

 pallisade parenchyma is scarcely developed at all, owing to the pre- 

 sence of stomata on the upper surface of the leaf. 



Pibro-vascular bundle single, and suiTounded by a well-marked 

 sheath. 



The figure (Plate 49, fig. 29) is drawn from a specimen supplied to 

 me by my father, and cultivated in the E.oyal Botanic Garden, 

 Edinbui'gh. Another specimen is figured (Plate 49, fig. 29 a) which 

 was sent to me by my father as Picea amabilis, Douglas. 



Pseudotsuga nobilis is a bifolious species, the leaves on the cone- 

 bearing shoots being very like those of magnifica. Indeed it is very 

 difficult, even in cone-bearing specimens, to separate the one from 

 the other anatomically. 



I have examined many specimens of nobilis from Glasnevin, Edin- 

 burgh, and from jMr. Syme of Elvaston, both of old and young plants. 

 Many native specimens have also been examined, one from Douglas, 

 in Kew Herbarium, " P. nobilis, Sabine. On the high mountains at the 

 Grand Eapids, on the Columbia River, and near the base of j^tlount 

 Hood, 1825;" several specimens from Jeffrey; one in Kew Herbarium, 

 and two in the Edinburgh collection. One of these is l^o. 398, 

 "Chastey BuU, TJ. California, Lat. 41°, elevation 9,000 feet, Oct. 12, 

 1852." The leaves on the cone-bearing shoots of this specimen are 

 remarkably like those of P. magnifica, but the long projecting scales 

 of the cone show that it is not magnifica. There is also a specimen 

 of nobilis from the Cascades of Columbia, Dr. Gardener. 



The leaves of the type specimen of P. amabilis, Sab., Douglas, 

 sent to me by Professor Oliver are those of P. nobilis (Plate 49, 

 fig. 29 b), but may be those of magnifica. 



2. Finus {Pseudotsuga) magnifica. Ah'es magnifica, A. Murray, Proc. 

 Eoyal Hort. Soc. London, iii. ]d. 318. 



Shoots covered with fine hairs. Leaves inserted singly all round 

 the stem, very close together, leaves on the lower side of the shoot 

 directed laterally by being curved outwards, but not twisted at the 

 base, those on the upper side of the shoot rather closely appressed, 

 not twisted ; upper side of leaf towards the branch, and directed towards 

 the apex of the branch, almost covering the shoot. Leaf rigid, linear, 

 more or less falcate, with an obtuse or rather bluntly-pointed apex, 

 upper surface of leaf with numerous rows of stomata, often with 8 or 

 more rows, and giving the leaf a whitish appearance ; beneath with a 

 band of stomata on each side of the midrib, there being from 4 to 6 ■ 

 rows of stomata in each band. Leaves about 1 to 1^ inch in length. 



