Manchester Memoirs^ Vol. Hi. (1908), No. *$ 7 



The ligule is inserted in a deep depression in the 

 upper surface of the sporophyll, between the upturned 

 lamina and the attachnnent of the sporangium ; this space 

 it entirely fills (See Text-fig. 2 and Figs, i and 3 of Plate'). 



It is a small organ, with a rounded top, about 0"3 mm. 

 high and 015 mm. broad ; it is composed of small square 



Text-fig. 2 . 



Transverse section of a crushed cone zi Bothrodendroii inundum (Will.) 

 A188 D. M. S. Watson's collection from the mountain four foot coal of 

 South Grain Dulesgate. Camera lucida drawing only shading dia- 

 grammatic. X 15 approx. 



xrii = wood . 



/«f = middle cortex of axis. 

 06= outer cortex of axis, displaced. 

 spli = sporophyll. 

 <^= ligule in pit in sporophyll. 

 '//e^. JW = megasporangium. 

 w/r. sm. =microsporangium. 



parenchymatous cells agreeing exactly with those of the 

 ligule oi ]\Iiadcsinia and the ordinary Lepidodendraceae. 



The ligule always appears light-coloured in the 

 sections which I have examined. The lamina, which is 

 directed vertically, has a distinct groove on its inner 

 surface which receives the ligule ; this gives an exceedingly 

 characteristic form to transverse sections of the lamina in 



