Woodburn. — Spermatogenesis in Blasia pusilla , L. ioi 
Leclerc du Sablon (’88) : Sur la formation des antherozoides des Hepatiques. Comptes rendus 
des stances de l’Academie des Sciences, ser. i, vol. cv, Mar., 1888, pp. 876-8. 
Van Hook, J. M. (’00) : Notes on the Division of the Cell in Liverworts, Bot. Gaz., vol. xxx, 
No. 6, Dec., 1900, pp. 394-9. 
Wilson, Malcolm (’ll) : Spermatogenesis in the Bryophyta. Ann. of Bot., vol. xxv, No. xcviii, 
Apr., 1911. 
Woodburn, Wm. L. (’ll) : Spermatogenesis in certain Hepaticae. Ann. of Bot., vol. xxv, No. xcviii, 
Apr., 1911, pp. 299-331. 
EXPLANATION OF FIGURES IN PLATE XI. 
Illustrating Mr. Woodburn’s paper on Spermatogenesis in Blasia. 
Figs. 3, 4, 7, 8, 9, 11, 12, 13, and 14 were drawn with the aid of the camera lucida and with 
a Leitz apochromatic 2 mm. objective, 1-30 apert. with compensating ocular 18. x 3,000. 
Figs. 1, 2, 5, and 10 were drawn with the aid of the camera lucida and a Spencer achromatic 
1.5 mm. objective and Bausch and Lomb ocular, x 2,000 at table level. 
Blasia pusilla. 
Fig. 1. A cell of spermogenous tissue in a resting condition. 
Fig. 2. Nucleus of a spermogenous cell in early prophase of division. 
Fig. 3. A slightly more advanced stage than Fig. 2, showing the condition of the cytoplasm. 
Fig. 4. Anaphase. 
Fig. 5. Spermogenous cell just previous to last division. The membrane has drawn away from 
the cell- wall. 
Figs. 6 and 7. Pairs of spermatids immediately following the last division, showing different 
conditions of the chromatin, and the dense areas of cytoplasm where the blepharoplast will appear. 
Fig. 8. Spermatid in the same stage of development as in Figs. 6 and 7, but viewed from 
a different angle. The section lies in the same plane as that of the last division. 
Fig. 9. Pair of spermatids, showing the blepharoplast organized as a definite granule. The 
cytoplasm represented in Fig. 5 has divided. 
Fig. 10. Single spermatid. Blepharoplast beginning to lengthen ; viewed from the same angle 
as Fig. 8. 
Fig. 11. Pair of spermatids, showing the course of the blepharoplast. 
Fig. 12. Sickle-shaped spermatid in about the same stage of development as in Fig. 11, 
viewed from the same angle as in Fig. 10, showing nucleus and blepharoplast in close contact. 
Fig. 13. Sperm becoming coiled within the spermatid membrane. 
Fig. 14. Mature sperm as found in antheridium. The cilia have become detached. 
Fig. 15. Mature escaped sperm of Funaria , showing blepharoplast and cilia. 
