Paper, 'Studies in the morphology of spore-producing members. Preliminary statement on the Equisetaceae [horsetail] and Psilotaceae' by Frederick Orpen Bower Bower writes: 'Still maintaining the same general views as were put forward in my preliminary statement on the Lycopodinae and Ophioglossaceae (‘Roy. Soc. Proc.,’ vol. 50, p. 265) [see PP/18/14], I have now investigated other types from among the Vascular Cryptogams as regards the development of their spore-producing members. As some considerable time must still elapse before these and other results can be laid in full before the Society, a further preliminary statement will now be made of the more important facts recently obtained.' Annotations in pencil and ink. Subject: Botany / Mycology Received 30 January 1893. Read 16 February 1893. A version of this paper was published in volume 53 of the Proceedings of the Royal Society as 'Studies in the morphology of spore-producing members. Preliminary statement on the equisetaceæ and psilotaceæ'. 1893