262 Dawson.—On Biology of Poronia punctata [Li). 
Fig. 15, a and b. Portions of mycelium grown from ascospore (Fig. 13) showing 
cross-connexions of hyphae. Nov. 14, 11 a.m. (x 180.) 
PLATE XV. 
Fig. 16. Portion of head of stroma, showing perithecia in various positions, and 
of different ages. ( x 90.) 
Fig. 17. Young stroma taken from extreme left of culture, shown in Fig. 4, e. 
Hardened in Hermann’s solution. Stained with Rubin S. Deeply stained, 
swollen hyphae below apical regions. ( x 20.) 
Fig. 18. Deeply stained swollen hyphae in stroma of age represented in Fig. 16. 
These hyphae especially abundant in outer regions of stroma, a (x 150); 
b ( x 1260.) 
Fig. 19. First stages in coiled Woronin’s hypha, before growth of investing 
hyphae. a ( x 230) ; b ( x 340.) 
Fig. 20. Perithecium showing Woronin’s hypha, and trichogyne-process passing 
to exterior. Iron Alum, Haematoxylin. ( x 230.) 
Fig. 21. Two consecutive sections of same perithecium showing coiled hypha 
and trichogyne. Coil becoming broken up, and form of perithecium less spherical, 
(x 230.) 
Figs. 22-25. Stages in development of perithecium, showing formation of central 
cavity, periphyses, paraphyses and ascogenous hyphae. ( x 170.) 
Fig. 26. Mature perithecium, ostiole completely formed. Asci of different ages 
lining the hymenial layer. ( x 170.) 
Fig. 27. Broad deeply stained hypha, grown up from amongst vegetative hyphae 
and coiled to form Woronin’s hyphae. Surrounding investing hyphae smaller 
celled. Iron Alum, Haem. ( x 680.) 
Fig. 28. Group of asci, from perithecium hardened in Abs. Ale. Asci in dilute 
ammonium hydrate. ( x 300.) 
Fig. 29. Young asci separated out showing accompanying paraphyses. ( x 300.) 
Fig. 30. Different stages in development of ascospores. a and b (x 600) ; 
c and d ( x 400.) 
Fig. 31. Stroma grown in pure culture. Conidial formation from terminal 
hyphae. No perithecia forming. ( x 40.) 
Fig. 32. Formation of conidia, breaking up of conidia-bearing hyphae. ( x 330.) 
Fig. 33. Group of fresh ascospores, showing lateral slit-like depression of 
exosporium. ( x 320.) 
