Harper . — Cell- Division in Sporangia and A sci. 525 
Fig. 19. Four protospores, which have enlarged and become multinucleate. 
x 250. 
Fig. 20. Embryonic cell, with nuclei arranging themselves in two groups with 
formation of hyaline equatorial zone, x 1250. 
Fig. 21. Slightly older than the last, x 1250. 
Fig. 22. Division of embryonic cell by constriction, x 1250. 
Fig. 23. Mature binucleated sporangiospore with wall. • x 1250. 
Fig. 24. Outline drawing of a part of a median section through a sporangium with 
binucleated sporangiospores ; a , sporangial wall ; b } collar, showing its extension 
upward on the columella ; c, intersporal homogeneous slime ; d, columella- wall ; 
, protoplasm of columella. 
Fig. 25. Spore swollen and germinating in nutrient medium, x 1250, stained 
with ‘ carmalaun.’ 
Fig. 26. Outline of germinating spore at later stage with seven nuclei, x 1250. 
Fig. 27. Spore with germ tube and numerous nuclei, x 1250. 
Fig. 28. Drawn from living spore germinating in water. Figs. 28-32 drawn with 
apoch. obj. 2 mm. and oc. 8. 
Fig. 29. Later stage of germination in water, which showed streaming protoplasm. 
Fig. 30. Living spore germinating in nutrient medium. 
Fig. 31-32. Later stages of germination. 
Figs. 33~37* Sporodinia grandis. 
Fig. 33. Median longit. section of young sporangium, showing the beginning of 
the differentiation of the spore-plasm, x 425. 
Fig. 34. Median longit. section, showing the development of vacuoles which are 
to form the columella-cleft, x 425. 
PLATE XXVI. 
Fig. 35. Section showing dense spore-plasma and foamy protoplasm ofcolumella 
and their separation by large and small vacuoles, x 1000. 
Fig. 36. Section showing formation of columella-cleft and furrows passing upward 
to divide the spore-plasma, x 425. 
Fig. 37. Median section of sporangium with ripe spores. 
Figs. 38-48. Lachnea scutellata . Figs, drawn with obj. 2 mm. and oc. 8. 
Fig. 38 enlarged. Figs. 42 and 46 reduced. 
Fig. 38. Ascus with nucleus dividing, daughter nuclei still connected by spindle 
fibres ; a , nucleolus. 
Fig. 39. Ascus with the two nuclei in equatorial plate stage. 
Fig. 40. Later stage of division in binucleate ascus. 
Fig. 41. Ascus with four nuclei in equatorial plate stage. 
Fig. 42. Ascus in octinucleate stage. Five nuclei with asters shown in section. 
Fig. 43. Nuclei with beaks, at whose apex is the aster. 
Fig. 44. Formation of ascospores by free cell-formation. 
Fig. 45. Later stage of same process. 
Fig. 46. Ascus in section, showing five spores with their plasma-membranes just 
completed ; interior aster rays still present. 
Fig. 47. Ascus in section, with seven spores; beaks still present on part of the nuclei. 
Fig. 48. Ascus with eight spores, still somewhat flattened upon each other. 
