GROUPS OF PLANTS. 



6i 



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

 species which inhabit temperate regions. These vary consid- 

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



Fig. 37. Several Osmundas. i, the royal fern (0. rega/w) 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 (O. cinnamomea) showing a fertile leaf (sporophyll) to the left and a sterile 

 leaf (foliage leaf) to the right. 



high, as the slender Cliff Brake (Pellcua Stelleri) (Fig. 38, illus. 

 i) and maiden hair spleenwort (Asplenium trichomanes) (Fig. 

 38, illus. 4), to plants several feet high, as in the several species of 



