@article{01e9ec2008254f11b5a244ee7008f619,
title = "Diversity of exine structure in Upper Carboniferous (Westphalian) selaginellalean megaspores",
keywords = "lycopsid, megaspores, Selaginella, sporopollenin, Triangulatisporites, ultrastructure, ULTRASTRUCTURE",
author = "Cottnam, {C F} and Hemsley, {A R} and R Rossler and Collinson, {M E} and Brain, {A P R}",
year = "2000",
month = mar,
language = "English",
volume = "109",
pages = "33--44",
journal = "Review of Palaeobotany and Palynology",
publisher = "Elsevier",
number = "1",
}