438 Fr. J. Mathiesen, 



become thickened, lignified and porose, the same is seen to 

 be the case as regards the inner part of the parenchyma- 

 rays, which separate the vascular bundles. Around the Ves- 

 sels non-lignified elements occur, but the limit of the first- 

 year's growth is shown in the vascular bundles by a layer 

 of wood-fibres, 2 — 3 cells thick, which adjoins the lignified 

 parenchyma rays, so that a continuous stereom results. The 

 few scattered vessels outside this I regard as the growth of 

 the second year; such small groups of vessels may also occur 

 in the space between any two of the original vascular bundles. 

 A second individual exhibited a similar structure, but in a 

 third I found no trace of a second-year's growth; unfortu- 

 nately the scantiness of the material prevented my studying 

 this point more thoroughly. A portion of the cortex is shown 

 in Fig, 27, C; with the exception of the two outermost layers 

 it is very lacunose in structure. The epidermis is small- 

 celled, and furnished with a rather thick cuticle. 



The Leaf. The epidermis is of the usual Pedicularis- 

 type, the lateral walls of the cells are thin and only slightly 

 porose, very similar to those in P. hirsuta and lanata. Sto- 

 mata occur only on the lower surface of the leaf ; the guard- 

 cells are on a level with the other epidermal cells. A trans- 

 verse section is shown in Fig. 27, Z); the part which has 

 been illustrated is typical and also agrees well with Th. 

 Holm's Fig. 4, Tab. VII. The upper half of the mesophyll 

 consists of 2 — 3 layers of short, thick palisade-cells, and the 

 lower half of spongy parenchyma composed of rather deci- 

 dedly branched cells. Chlorophyll occurs abundantly in the 

 whole of the mesophyll. Glandular hairs of the same form 

 and size as in the other species of Pedicularis, occur also 

 in P. sudetica on the lower surface of the leaf — not as Th. 

 Holm (1. c. p. 44) writes "here and there," but in abun- 

 dance below the branches of the veins of tertiary and higher 



