B. B. HIGGINS 
4. Frank, B. Ueber Gnomonia erythrostoma, die Ursache einer jetzt herrschenden Blatt- 
krankheit der Siisskirchen im Altenlande, nebst Bemerkungen iiber Infection bei 
blattbewohnenden Ascomyceten der Baume iiberhaupt. Ber. Deutsch. Bot. Ges. 
4: 200-205. 1886. 
5. Higgins, B. B. Contribution to the life history and physiology of Cylindrosporium on 
stone fruits. Amer. Journ. Bot. i: 145-173. Pis. 13-16. 1914. 
6. . Life history of a new species of Sphaerella. Mycol. Centralbl. 4: 187-193. 
2 figs. 1914. 
7. Miiller, K. Zur Biologie der Schwartzfleckenkrankheit der Ahornbaume, hervor- 
gerufen durch den Pilz Rhytisma acerinum. Centralbl. Bakt., Parasitenk. u. 
Infectionsk. II, 36: 76-98, 4 figs, and 4 pis. 1913. 
8. Nienburg, W. Zur Entwicklungsgeschichte von Polystigma rubrum DC. Zeitschr. 
Bot. 6: 369-400. 17 figs. 1914. 
EXPLANATION OF PLATE XXX 
(All figures X 580) 
Fig. 2. A young spermogonium (or perithecium) in the lower side of a fig leaf, de- 
veloping at the base of conidiophores; from material killed October 16, 191 5. 
Fig. 3. Young spermogonium (or perithecium) breaking the host epidermis. 
Fig. 4. Young spermogonium in which spermatia are beginning to form. The wall 
not yet differentiated. 
Fig. 5. Mature spermogonium with spermatia being pushed out in a mucilaginous 
mass. 
Fig. 6. Young perithecium with four-nucleate carpogonium. c, an abnormal conidio- 
phore. 
Fig. 7. Young perithecium with binucleate ascogonium; portion of dead trichogyne 
still persistent at the apex. 
Fig. 8. Slightly excentric section of perithecium, with ascogenous hyphae and young 
asci. s, portion of the wall of an old, empty spermagonium. 
Fig. 9. Section of mature perithecium. 
