GUIDE 



GROUP II 



FERTILE FRONDS PARTIALLY LEAF-LIKE, THE FERTILE PORTION 

 UNLIKE THE REST OF THE FROND 



[The species coming under the genera Botrychium and Ophio- 

 glossum may appear to belong to Group I, as the fertile and the 

 sterile portions of their fronds may seem to the uninitiated like sep- 

 arate fronds, but in reality they belong to the one frond.] 



5. ROYAL FERN 



Osmunda regalis 



Large. Sterile fronds twice-pinnate, pinnules oblong. Fertile 

 fronds leaf-like below, sporangia in clusters at their summits. In 

 wet places. P. 67. 



6. INTERRUPTED FERN 



Osmunda Claytoniana 



Large. Sterile fronds once-pinnate, pinnae pinnatifid. Fertile 

 fronds leaf-like above and below, contracted in the middle with 

 brown fruit-clusters. In wet places. P. 72. 



7. CLIMBING FERN 



Lygodium palmatuTn 



Climbing, with lobed, palmate pinnae and terminal fruit-clusters. 

 Moist thickets and open woods. Rare. P. 75. 



8. ADDER'S TONGUE 



Ophioglossum vulgatum 



Small. Sterile portion an ovate leaf. Fertile portion a slender 

 spike. In moist meadows. P. "j-j. 



9. RATTLESNAKE FERN 



Botrychium Virginianum 



Rather large. Sterile portion a thin, spreading, ternately di- 

 vided leaf with three primary divisions ; 1-2 pinnate. Fertile por- 

 tion a branching fruit-cluster. In rich woods. P. 80. 



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