Sporangia and Spores of Aneimia phyllilidis. 1067 
Thomson, R. B. (’ 05 ): The Megaspore Membrane of Gymnosperms. University of Toronto 
Studies, No. 4. 
Twiss, Edith Minot (TO) : The Prothallia of Aneimia and Lygodium. Bot. Gaz., xlix, p. 168. 
DE Vries, Hugo (’ 85 ) : Ueber die Bedeutung der Circulation und der Rotation des Protoplasma 
fiir den Stofftransport in der Pflanze. Bot. Zeit., Jahrg. xliii, p. 18. 
EXPLANATION OF PLATES LXXXIV, and LXXXV. 
Illustrating Professor Stevens’s paper on Aneimia. 
PLATE LXXXIV. 
Fig. 1. Longitudinal section through the apex of a young sorophore, showing sporangia in 
successive stages of development, x 393. 
Fig. 2. Median longitudinal section through young sporangium, showing wall-cells, initial 
cells of tapetum, and archesporium. x 860. 
Fig. 3. Median longitudinal section through young sporangium, slightly older than in Fig. 2. 
The initial cells of the tapetum have divided, producing a two-layered tapetum, and the archesporium 
has undergone division. Even at this early stage the walls of the tapetum have begun to be 
absorbed, x 308. 
Fig. 4. Still older stage than in Fig. 3, showing young gonotokonts or grandmother-cells of the 
spores surrounded by the two-layered tapetum. x 860. 
Fig. 5. Section remote from the centre through a sporangium, showing tapetal cells completely 
broken down and tapetal nuclei migrated from the periphery to cluster about the gonotokonts, two 
of which are here shown, x 308. 
Fig. 6. Longitudinal section through young sporangium and sorophore, showing the epidermal 
cells of the upper surface greatly enlarged, resulting in the turning of the sporangia, which are at 
first marginal, to the under side of the sorophore. x 393. 
Fig. 7. Section through sporangium, showing mature gonotokonts previous to the synaptic 
stage. At this stage the wall-cells are filled with starch grains, x 540. 
PLATE LXXXV. 
Fig. 8. Section through young sporangium. All of the mother-cells of the tapetum have 
divided but one, and this is in the late prophase of division. Even at this early stage the meshes of 
the cytoplasm of the wall-cells are being filled with reserve starch, x 860. 
Fig. 9. Portion of tapetal plasmodium and embedded gonotokonts in the synaptic stage. One 
of the gonotokonts disintegrating, x 860. 
Fig. 10. After second meiotic division, showing young spores still in contact, x 860. 
Fig. 11. A later stage. Young spores separated and dispersed within the cavities previously 
occupied by their respective grandmother-cells, x 860. 
Fig. 12. The same as Fig. 11, but showing thin strands of cytoplasm that evidently had flowed 
in between the spores while they were yet in close proximity. x 860. 
Fig. 13. Longitudinal section through a sporangium, showing young spores after the tapetal 
plasmodium has surrounded each one separately. The wall-cells, excepting the cap-cells, are 
loaded with reserve starch, x 308. 
Fig. 14. One of the wall-cells of Fig. 13, showing reserve starch assembled about the nucleus, 
x 860. 
Fig. 15. Polar view of late prophase of the first meiotic division, x 2,000. 
Fig. 16. Early anaphase of the first meiotic division, x 2,000. 
Fig. 17. Telophase of second meiotic division. Nuclear membrane not yet. formed, x 2,000. 
