416 Cutting. — On the Sexuality and Development of 
VIII. The tips of the ascogenous hyphae bend over in the usual 
manner, and the ascus is formed from the penultimate cell after the fusion 
of the two nuclei which it contains. 
IX. The ascus contains eight spores with walls of medium thickness. 
These spores germinate only in alkaline media (in one case a spore was 
observed to germinate in an acid medium) and under the influence of 
a medium temperature (about 35 0 C.). 
References. 
1. Barker, B. T. P. : The Development of the Ascocarp in Ryparobius . Report Brit. A.A.S., 
Southport, 1903, p. 849. 
2. : Further Observations on the Ascocarp of Ryparobius. Report Brit. A.A.S., 
1904. 
3. Baur, E. : Zur Frage nach der Sexualitat der Collemaceen. Ber. d. Deutsch. Bot. Ges., xvi, 
1898, p. 303. 
4. : Untersuchungen liber die Entwickelungsgeschichte der Flechtenapothecien. Bot. 
Zeit., lxii, 1904, p. 21. 
5. Blackman, V. H. : On the Fertilization, Alternation of Generations and General Cytology of 
the Uredineae. Ann. Bot., xviii, 1904, p. 323. 
6. and Fraser, H. C. I. : Fertilization in Sphaerotheca. Ann. Bot., xix, 
I 9°5, PP- 567-9- 
7. : On the Sexuality and Development of the 
Ascocarp in Humaria granulata. Proc. Roy. Soc., London, Ser. B., lxxvii, 1906, p. 354. 
8. ClausseN, P. : Zur Kenntnis der Kemverhiiltnisse von Pyronema confluens. Ber. d. Deutsch. 
Bot. Ges., xxv, 1907, p. 586. 
9. Dale, E. : Observations on the Gymnoascaceae. Ann. Bot., xvii, 1903, p. 571. 
10. Dangeard : L’origine du perithece chez les Ascomycetes. Le Botaniste, 10, Juillet 1907. 
11. Darbishire, O. V. : Uber die Apothecienentwickelung der Flechte Physcia pulverulenta 
(Schreb.) Nyl. Jahrb. f. wiss. Bot., xxxiv, 1899, p. 329. 
12. Davis, B. M. : Oogenesis in Saprolegnia. The University of Chicago, 1903. 
13. De Bary, A. : Comparative Morphology and Biology of the Fungi, Mycetozoa, and Bacteria. 
Oxford, 1887. 
14. Fraser, IT. C. I. : On the Sexuality and Development of the Ascocarp in Lachnea stercorea. 
Ann. Bot., xxi, 1907, p. 349. 
15. : Contributions to the Cytology of Humaria rutilans. Ann. Bot., xxii, 1908, 
P- 35- 
16. Fraser, H. C. I., and Chambers, H. S. : The Morphology of Aspergillus herbariorum. Ann. 
Mycol., v, 1907, r p. 420. 
17. Fraser, H. C. I., and Welsford, E. J. : Further Contributions to the Cytology of the 
Ascomycetes. Ann. Bot., xxii, 1908, p. 465. 
18. Harper, R. A. : Entwickelung des Peritheciums bei Sphaerotheca Castagnei. Ber. d. Deutsch. 
Bot. Ges., xiii, 1895, p. 475. 
19. — : Uber das Verhalten der Kerne bei der Fruchtentwickelung einiger Ascomyceten. 
Jahrb. f. wiss. Bot., xxix, 1896, p. 655. 
20. : Sexual Reproduction in Pyronema confluens and the Morphology of the 
Ascocarp. Ann. Bot., xiv, 1900, p. 321. 
21. : Sexual Reproduction and the Organization of the Nucleus in certain Mildews. 
Publ. Carnegie Inst. Washington, No. 37, 1905. 
