ON WOODSIA. 255 



EXPLANATION OF TAB. 38 (XI). cm 



1. A native specimen of Woodsia hyperborea, natural 



size. 



2. The stipes and lower part of the frond of the same 



plant, magnified 3 times in diameter. 



3. A pinna of the same plant, magnified 10 diam. 



4. A pinna from another specimen, in which the 



clusters of capsules (sori) are more numerous 

 and confluent, 10 diam. 



5. A single cluster of capsules within their involucrum, 



the membranaceous base of which they entirely 

 conceal, magnified 50 diam. (2500 times in 

 superficies). 



6. The involucrum spread open, with only one cap- 



sule left in it, magnified 50 diam. 



7. An unripe capsule. ~1 



8, 9. Side and back views of a ripe capsule. I magnified 

 10,11. Capsule opening and entirely burst, | 50 diam. 

 shedding its seeds. J 



12. A seed magnified 200 diam. 



13. A frond of a cultivated plant of the same species, 



natural size. 



