pandey , s.n. a text book of botany bryophyta , pteridophyta , gymnosperms and palaeobotany / [[Book] :] s.n. pandey , s.p. misra , p.s. trivedi. - 11 ed. - new dlhi : Vikas publishing house pvt ltd, 2004. - 644 p. ; 22cm. - 2 . ISBN: 0706996186 Dewey Class. No.: 580