AND THEIR BEARING!- ON STELAR THEORIES FOR THE FERNS. 
733 
Figs. 23-24. Transverse sections of an isolated spindle of inner endodermis in the sclerotic pith of an 
adult stem ; En., the endodermis ; T, enclosed tracheides. (All x 80.) 
Figs. 25-30. Gleichenia pectinata. Successive transverse sections from the protostelic base to a solenostelic 
tract of a juvenile plant reconstructed in text-fig. 3. En.', inner endodermis ; En., outer endodermis ; M, pith ; 
Ph.', inner phloem ; Ph., outer phloem ; T, tracheides in a “mixed-pith” ; X, xylem. (All x 45.) 
Figs. 31-33. Lindsaya adiantifolia. Successive transverse sections from the stele of a juvenile plant 
reconstructed in text-fig. 5. Fig. 31 is from the base; fig. 33 is from a level showing the full “Lindsaya” 
structure. L, leaf-trace ; Ph/, inner phloem; Ph., outer phloem; Pr., pericycle ; S, parenchymatous portion 
of pith; X, base of leaf-trace. (All x 50.) 
Figs. 34-43. Loxsoma Gunninghamii. Transverse sections of the stele of juvenile plants at successive 
ascending levels referred to in reconstructions (text-figs. 6, 7, and 8). They show the transition from the 
protostelic base (fig. 34) to the full solenostelic structure of the adult (fig. 43) ; En.', inner endodermis ; 
G, leaf-gap; M, pith; P, pocket; Ph., outer phloem ; Ph/, inner phloem. (All x 50.) 
1 gratefully acknowledge my indebtedness to the Executive Committee of the Carnegie Trust for a. 
grant to defray the expense of the plates illustrating this memoir. 
BIBLIOGRAPHY. 
In the following list of titles no attempt has been made at completeness, but works on stelar anatomy 
bearing directly on the subject of this memoir alone are cited. 
(1) Bertrand, Paul, “L’etude anatomique des Fougeres anciennes et les problemes qu’elle souleve,” 
Progressus Rei Botanicse, Jena, 1913. 
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(3) Boodle, L. A., “On the Anatomy of the Schizaeaceas,” Ann. of Bot., vol. xv, London, 1901. 
(4) Boodle, L. A., “On the Anatomy of the Gieicheniaceae,” Ann. of Bot., vol. xv, London, 1901. 
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(6) Boodle, L. A., and Hiley, W. E., “ On the Vascular Structure of some Species of Gleichenia,” 
Ann. of Bot., vol. xxiii, London, 1909. 
(7) Bower, F. O., The Origin of a Land-Flora, London, 1908. 
(8) Bower, F. O., “ Plagiogyria,” Ann. of Bot., vol. xxiv, London, 1910. 
(9) Bower, F. O., “ On the Primary Xylem, and the Origin of Medullation in the Ophioglossacese,” 
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(10) Bower, F. O., “Medullation in the Pteridophyta,” Ann. of Bot., vol. xxv, London, 1911. 
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(12) Brebner, G., “On the Anatomy of Dans&a and other Marattiaceae,” Ann. of Bot., vol. xvi, 
London, 1902. 
(13) Britton, N. L., and Taylor, N., “Life History of Schizeea pusillaf Bull. Torrey Bot. Club, 
vol. xxviii, 1901. 
(14) Campbell, D. H., “The Development of the Ostrich Fern,” Mem. Boston Soc. Nat. Hist., 1887. 
(15) Campbell, D. H., The Eusporangiatse, Washington, 1911. 
(16) Chandler, S. E., “On the Arrangement of the Vascular Strands in the ‘Seedlings’ of Certain 
Leptosporangiate Ferns,” Ann. of Bot., vol. xix, London, 1905. 
(17) Charles, G. M., “ On the Anatomy of the Sporeling of Marattia alata,” Botanical Gazette, 
vol. xlii, Chicago, 1911. 
(18) Conard, H. S., “The Structure and Life-History of the Hay-Scented Fern,” Carnegie Institution 
Publication, Washington, 1908. 
