Pandey, S N, et al. <br/><br/>
Book of botany, Vol.2: Bryophyta, Pterodophyta, Gymnosperms and Palaeobotany  

 -  Vikas Publishing House Pvt Ltd, New Delhi  1987 
 - 495 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botanical sciences
<br/><br/><label>Dewey Class. No.: </label>PG 580  PAN-B.2