Prescott, G. W A Synopsis of North American Desmids. Pt.2, Desmidiaceae: Placodermae: Sections 4 - Dehra Dun: Bishen Singh Mahendra Pal Singh, 2001 - 275 p. : 23 cm ISBN: 803236506 Subjects--Topical Terms: Algae Dewey Class. No.: 589.47 PRE