Macrosporium parasiticum , Tkiim. 25 
Fig. 4. A spiral formation of a very slender and transparent hyphal branch, 
formed on the mycelium of Macrosporium- spores sown in water, a , portion 
filled with fatty matters ; b, spiral portion, x 800. 
Fig. 5. Process of formation of the spores by abstriction. a, young fertile hypha 
before abstriction ; b, after abstriction, basidum-portion growing ; d, the spore 
dividing, and the wall of the basidium considerably thickened x 400. 
Fig. 6. Twin-spores, the spore a formed later, x 400. 
Fig. 7. Youngest stage of a perithecium formed on the mycelium of the 
Macrosporium-spore. a, initial cells ; b, hyphal branches, x 500. 
Fig. 8. A similar perithecium more advanced, x 500. 
Fig. 9. A similar one still more advanced, x 500. 
Fig. 10. Diagrammatic longitudinal section of the perithecium. a, darkened 
outer layer of cells ; b, closely united parenchymatous wall ; c, papilla ; d, basal 
cells of asci and paraphyses ; e, young asci ; f paraphyses. 
Fig. 11. Young paraphyses, /, and their basal cells, b. A , young basal cell, 
forked, x 500. 
Fig. 12. A, a young ascus ; n, nucleus ; v, vacuole ; paraphyses ; b, basal cells, 
B, one with very young spores, still colourless. C, somewhat advanced, spores 
with a light yellowish colour, x 500. 
Fig. 13. Ripened ascus obtained by sowing the Macrosporium-spore. x 440. 
Fig. 14. Ripened ascus from the specimen of Sphaeria herbarum , Pers., in Wart- 
mann and Schenk, Schweiz. Krypt. n. 322. x 440. 
Fig. 15. Unripened ascus from the specimen of Pleospora Ailii, Ces. et de Not. 
in Herb. Critt. Ital., Ser. II. n. 644. x 440. 
Fig. 16. Fertile hyphae, a, and conidial spores, b and c, of Macrosporium 
parasiticum , Thiim., from the authentic specimens in Myc. Univ. n. 667. x 400. 
PLATE II. 
Abnormal hyphae formed on the mycelium of Pleospora herbarum , in Van 
Tieghem cell-cultures. Figs. 17-23 obtained by sowing Sarcinula- spores. 
Fig. 17. One drawn on Feb. 14, 4.25 p.m. x 500. 
Fig. 18. The same on Feb. 16, 3.30 P.M. x 500. 
Fig. 19. A similar process in the same culture, Feb. 15, 10 a.m. x 800. 
Fig. 20. The same on Feb. 16, 10 a.m. At c, another spiral-process was formed, 
x 500. 
Fig. 21. The spiral-process c, of Fig. 20, highly magnified. 
Fig. 22. The same arrangement on Feb. 18, 12 m . From the spiral c, two stout 
branches were formed, x 500. 
Fig. 23. One of simpler nature, x 500. 
Fig. 24. A trichogyne-like process formed on the mycelium of the ascospores 
of Pleospora herbarum , drawn after having been kept for about four months in the 
culture, a, fatty globules, x 500. 
