EXPLANATION OF FIGURES. 



PLATE VII. 



All figures refer to Kaiilfussia ncsculifolia Bl. 



Fig, 1. Young protliallium with anthe- 

 ridia, r/, seen from below, 25 X- 



Fig. 2. Apex of the same protliallium, 25X. 



Fig. 3. An older prothallium with arche- 

 gonia, 9, seen from below, 5X- 



Fig. 4. Horizontal section of the prothal- 

 lium-apex, 275 X, 'V apical cell. 



Fig. 5. Lower surface of a prothallium 

 with a young embryo, em, 2X' 



Fig. 6. Prothallium with young sporo- 

 phyte, 2 X ; cot. cotyledon ; r. the 

 primary root. 



Fig. 7. Upper (a) and lower (h) side of 

 a very large prothallium, (pr) with 

 the young sporophyte attached; na- 

 tural size. 



Fig. 8. A rhizoid showing its apparent mul- 



ticellular structure, 6b X; '*? nucleus. 



Fig. 9. Apex of a rhizoid, showing bran- 

 ching, 275 X. 



Fig. 10. Cells of the prothallium showing 

 the endophytic fungus; t\ vesicular 

 enlargements of the hyphae; 275 X- 



Fig. 11. Section of the apex of a young- 

 prothallium, showing oneof the initial 

 cells, X, and two antheridia, IIOX- 



Figs. 12 — 16. Development of theanthe- 

 ridiura seen in longitudinal section, 

 275X ; 0, the opercular cell ; m, mantle 

 cells. 



Fig. 17. Two transverse sections of a 

 young antheridium, 275 X- 



Fig. 18. Upper surface of an empty an- 

 theridium, 275 X. 



PLATE VIII. 

 All figures refer to Kaulfussia, 



Figs. 19 — 2 2. Development of the sper- 

 matozoid, 950 X ; ^i the blepharoplast. 



Figs. 23 — 29, Development of the arche- 

 gonium seen in longitudinal section, 

 275 X ; &, basal cell ; o, egg ; v. c, 

 ventral canal-cell; n.c, neck-canal-cell. 



Fig. 30. Nearly medium longitudinal 

 section of a young embryo, 275 X ; 

 &, basal wall; st, stem-apex (?). 



Fig. 31. Three nearly horizontal sections 

 of young embryo; 11 — II, quadrant- 

 wall, 275 X. 



Fig, 32. Medium section of the apex' of 



the single 



the first root, showing 

 apical cell, 275 X' 



Fig. 33. Cross-section of the apex of the 

 primary root, showing the single 

 apical cell, 275 X- 



Fig, 34. Cross-section of the va.scular 

 bundle of the first root, 110 X; en, 

 endodermis; x, xylem ; /)/i, phloem. 



Fig. 35. Cotyledon, 2X. 



Fig. 36. Sporophyte with three leaves, 

 attached to the prothallium, pv. 2X' 



Fig. 37. A later leaf, showing the ve- 

 nation and the stipules, s<; natural size. 



