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EXPLANATION of figures IN PLATES V AND VI. 
Illustrating Mr. Humphrey’s paper on Fossombronia longiseta , 
PLATE V. 
Except when otherwise indicated, all drawings were made from microtome sections, and were 
drawn with the aid of an Abbe camera lucida. All sections were stained with Flemming’s triple 
stain, except when otherwise stated. 
Fig. 1. A thrice dichotomous plant bearing three sporangia, natural size. 
Fig. 2. A plant bearing antheridia and archegonia. x 10. 
Fig. 3. A mature plant bearing a single sporogonium. x 10. 
Fig. 4. Initial cell of antheridium in which the first division has occurred, x 560. 
Fig. 5. A later stage in the development of the antheridium in which a second horizontal 
division has occurred and the first vertical wall is in process of formation, x 560. 
Fig. 6. Octant stage. Two vertical walls have formed at right angles to each other as 
indicated in Fig. 9, cross-section of an antheridium of same stage, x 560. 
Fig. 7. Stage in which periclinal -walls have formed, x 560. 
Fig. 8. Cross-section of stage represented in Fig. 5. x 560. 
Fig. 9. Cross-section of stage represented in Fig. 6. x 560. 
Fig. 10. Cross-section of stage represented in Fig. 7. x 560. 
Figs. 11 and 12. Cross-sections of later stages, x 560. 
Fig. 13. A mature antheridium drawn shortly before discharge of spermatozoids. Crown cells 
much swollen, x about 300. Ad. nat. 
Fig. 13 a. An antheridium that has discharged its spermatozoids. x 150. 
Fig. 14. Spirem stage of nucleus in cells of spermatogenous tissue of very young antheridium. 
x 2400. 
Fig. 15. Diaster stage of mitosis in cells of a somewhat older antheridium. x 1750. 
