iS 



WHERE TO FIND FERNS. 



species of which, Aspleninm ceterach, has been previously 

 figured on page 6. 



The next group, Osmundacea, includes only one genus 

 and one species in Britain, Osmnnda regalis ; and, though 

 the fronds are rolled up in the same way as in Poly- 

 podiacece, there is no elastic ring around the spore-cases, 

 and these are two-valved, and burst vertically. 



The accompanying marginal cut will show the shape 

 and manner of opening of the spore-case 

 and the form of the spores, all being, 

 of course, magnified. 



In the third group, Ophioglossacece, 

 are two genera and three species, viz., 



v \j ^ *-' ^ | ^_ 



Botrychiiim lunaria and Ophioglossum vulgatum and lusi- 

 tanicum. The fronds in this group are folded up straight, 



