150 
NEW AlillANGEMENT, &C» 
Plate VII. 
Fig. 17. Theca of Voitia nivalis, with its calyptra. 
18. Theca of the same cut open, to show the colu- 
mella, on the summit of which are traces of 
the membrane which closes the stoma. 
19. Theca of V. Tiyperhorea (nobis). 
SO. Sporules ; which are the same in both specieSo 
21. Leaf of K hyper borea. 
A portion of the leaf of either species, showing 
the form of the areolae. 
All the figures more or less magnified ^ 
