54 FERNS Of THE LAKE COUNTKY 



deep lobes which are found on the lowest pinnse. In 

 all the more compound Perns there is a similar differ- 

 ence of form according to the disposition of the pin- 

 nules, and in all such cases it is usual only to describe 

 the most complete that is, those at the base of a few 

 of the lowermost pinnse. The venation in the less 

 divided pinnules consists of a midvein giving off 

 branched venules, the sori borne on the lower anterior 

 venules proceeding from these, about midway between 

 the vein and the margin, thus forming an even double 

 row on each pinnule. The same arrangement occurs 

 on the lobes when the pinnule is more divided. The 

 indusia are kidney-shaped, with the margin entire. 

 L. spinulosa is common over the whole of England, 

 generally in moist shady places, ranging from the sea- 

 level to an elevation of 600 feet. In Scotland, Wales, 

 and Ireland it is rare. In the Lake Country it is 

 common in bogs and damp woods throughout the 

 district. 



