Pandey, S N, et al. <br/><br/>
Textbook of Botany, Vol.2: Bryophyta, Pteridophyta, Gymnosperms and Palaeobotany 

 - 2 
 -  Vikas Publishing House Pvt. Ltd., New Delhi  1977 
 - 526 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany
<br/><br/><label>Dewey Class. No.: </label>581  PAN-T2.2