Photoiiiicroi^raplis of Botanical Studies. 



17 



13.— Underside of entire Thallus of Fern, 

 " Gymnogramma Sp. " 



Thallus 



Archegonia Area. 



Antheridia. 



Rhizoids (root hairs). 



14.-Y.S. Thallus of Fern, "Gymnogramma Sp." (Passing through 

 Archegonia area). 



Upper surface of 

 Thallus. 



Ovum. 



Canal of neck open. 



Do., out of Median 

 plane. 



