@article {3729,
	title = {On the prothalli of Ophioglossum pendulum and Helminthostachys zeylanica},
	journal = {Ann. Bot.},
	volume = {16},
	year = {1902},
	month = {1902///},
	pages = {23 - 56},
	author = {Lang, W. H.}
}
@article {3059,
	title = {The prothallus of Lycopodium clavatum L.},
	journal = {Ann. Bot.},
	volume = {13},
	year = {1899},
	month = {1899///},
	pages = {279 - 317},
	author = {Lang, W. H.}
}
@article {3019,
	title = {On a prothallus provisionally referred to Psilotum},
	journal = {Ann. Bot.},
	volume = {18},
	year = {1904},
	month = {1904///},
	pages = {571 - 577},
	author = {Lang, W. H.}
}
