66 Proceedings of the Royal Irish Academy. 



beautifully straight stems, averaging 30 ft. tall. They suipass considerably in 

 height a group of Japanese larch, planted three years earlier, namely in 1906. 

 There is also a thriving plantation of L eurolepis at Leonardslee, Sussex. 



M. Liechti, Inspector of Forests at Moral, Ssvitzerland, in a letter to me 

 dated 31st August, 1919, states that Larix Marschlinsi in all probability is a 

 hybrid between Laru lq)lolfpk and Larix sihirica ; but this is not absolutely 

 certain, as there is a group of old trees of ordinary European larch about 400 

 metres distant from the mother Japanese tree, the pollen of which might have 

 been blown on the young cones of the latter. 



EXPLANATION OF I'lATE XI. 



Fig. 1. &. Lfirir eu)<'p(i<i. h. Larii: Icptolepis. c. Larix eurolepis. Sections 

 of the leaves of the long shoots ou the left, and of the leaves of the short 

 shoots on the right. The tibro-vascular bundle in the centre, the resin-canals 

 at the outer angles, and the epidennal layer of cells around the periphery, are 

 shown diagrammatically. The interruptions in the epidermis indicate the 

 position of the stomatic lines; but, owing to the irregularity of their 

 arrangement, all the lines are scarcely ever cut through in one section. 

 There is also shown in all the sections a short single layer of hypodermal 

 cells, confined to near the middle line of the upper and lower surfaces. 



Fig. 2. Reproduced from a photograph. 1. Larix eriropaea, 2. Larix 

 euroltpi*. 3. Larii Ui>(olepis. Mature cones, with the scales gaping apart 

 and the seeds fallen, on the left. Cones just before ripening, with the scales 

 unmoved and still bearing the seeds, on the right. 



