xiv] 



LYCOPODIUM 



47 



(fig. 126, A) to afford protection to the lower sporangia, their 

 efficiency being increased by the lignified and thicker walls 

 (A, a) of the cells in the lower portion of the laminar expansion. 

 The cells of the sporangial wall are provided with strengthening 

 bands which in surface- view (fig. 126, B) present the appearance 

 of prominent pegs. Since the appearance of Miss Sykes's 

 paper on the sporangium-bearing organs of the Lycopodiaceae, 

 Dr Lang* has published a more complete account of the 

 structure of the strobilus of Lycopodium cernuum in which he 



•no. 



Fig. 127. Badial longitudinal section of the cone of Lycopodium cernuum. 



(After Lang.) 



records certain features of special interest. The importance of 

 these morphological characters is increased by their agreement, 

 as shown by Lang, with those of the Palaeozoic cone Spencerites'. 

 The sporophylls of a cone (12 mm. long by 3 mm. in diameter) 

 of Lycopodium cernuum show an abrupt transition from the 

 foliage leaves, but like these they occur in alternate whorls of five. 

 A large sporangium is attached to the upper face of each sporo- 

 phyll close to the base of the obliquely vertical distal lamina 



Lang (08). 



2 See page 192, and Watson (09). 



