On the true nature of the cretaceous plant Ophioglossum granulatum, Heer
Stopes, Marie Carmichael, 1880-1958
Article
1911-10
Annals of botany
25
903--907
New York Botanical Garden, LuEsther T. Mertz Library
English
London, Academic Press [etc.],
DOI: https://doi.org/10.1093/oxfordjournals.aob.a089372