Comparative Anatomy of the Hymenophyl¬ 
laceae, Schizaeaeeae, and Gleicheniaceae. 
I. On the Anatomy of the Hymenophyllaceae \ 
BY 
L. A. BOODLE, F.L.S. 
With Plates XXV, XXVI, and XXVII. 
I N a note published last December 2 some types of 
structure found in the natural orders Schizaeaeeae, Gleiche¬ 
niaceae, and Hymenophyllaceae were shortly compared. The 
present paper contains a more detailed description of the 
structure of the Hymenophyllaceae, the anatomy of the 
other two orders, and a general comparison of the three, being 
reserved for a future paper. 
Among the works hitherto published on the Hymeno¬ 
phyllaceae, Prantl’s monograph 3 gives a large amount of 
information on the structure of the leaf and petiole, but his 
description of the stem is less complete, and needs supple¬ 
menting. The veins of the leaf and the pseudo-veins ( Schein - 
nerveri) have been fully described by Prantl and other authors 4 ; 
1 From the Jodrell Laboratory, Royal Gardens, Kew. 
2 Boodle, Annals of Botany, vol. xiii, 1899, p. 624. 
3 Prantl, Unters. z. Morph, d. Gefasskrypt.: I. Hymenophyllaceen, 1875. 
4 Mettenius, Ueber die Hymenophyllaceen, Abh. d. k. Sachs. Ges. d. Wiss., VII, 
1864; Prantl, 1. c., &c. 
[Annals of Botany, Vol. XIV. No. LV. September, 1900,] 
