GROUPS OF PLANTS. 



6i 



(2) The True Ferns include by far the largest numl)er of 

 species which inhabit temperate reg-ions. These vary consid- 

 erably in size ranging- from quite diminutive plants 5 to 12 cm. 





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Fig. 37. Several Osmundas. i, the royal fern (C regaZis) showing fertile tip of branch 

 and sterile bipinnate leaflets below; 2, Clayton's fern (O. Claytoniana) showing three 

 pairs of fertile leaflets in the middle and a number of sterile leaflets above and below; 

 3, cinnamon fern (0. cinnamomea) showing a fertile leaf (sporophyll) to the left and a sterile 

 leaf (foliage leaf) to the right. 



high, as the slender Cliff Brake {Pellcea atropiirpiirea and the 

 variety cristata) and maiden hair spleenwort {Asplcniutn Tncho- 

 maiics), to plants several feet high, as in the several species of 



