OLIVE: STRUCTURE OF BOTRYORHIZA HIPPOCRATEAE 341 
EXPLANATION OF PLATE VII 
All drawings have been made with the camera lucida, and with various combina- 
tions of Zeiss apochromatic lenses. Except where otherwise noted, the magnification 
has been 1,000 diameters. 
Botryorhiza Hippocrateae Whetzel & Olive 
Fic. 1. Two young sori, showing the hymenial layer, composed of binucleate 
cells, and method of spore formation. At the right a young sorus pushing through a 
stoma. Somewhat diagrammatic. XX 500. 
Fic. 2. Branching hypha, showing the binucleate cells, whose walls in some 
places show peculiar thickenings. XX 500. 
Fic. 3. Young haustorium, containing 4 nuclei. Note the invagination of the 
host cytoplasm. 
Fic. 4. Another haustorium, pushing into a mass of dense, granular host 
protoplasm. 
Fic. 5. A fully mature haustorium, showing its botryose lobings. 
Fics. 6 and 7. Haustoria in partial section; showing the pushing in of host 
protoplasm. 
Fic. 8. A young hypha from the hymenium, showing the constricting wall 
cutting off stalk from spore. % 1,500. 
Fic. 9. A young spore, with two nuclei. 
Fic. 10. A young spore in which the two nuclei have just fused, as evidenced 
by the presence of two nucleoles. 
Fics. 11 and 12. Mature teliospores, showing binucleate stalks. 
Fic. 13. A spore showing young germ-tube. 
Fic. 14. Another spore, with growing basidium, or promycelium, The 
nucleus is in metaphase of the heterotypic division; but the preparation is poorly 
stained. 
Fics. 15,16 and 17. Three basidia, which have divided into the characteristic 
4 cells. Fig. 16 shows the branches, each of which will bear ultimately a single 
basidiospore. 
Fic. 18. Two basidiospores, showing the uninucleate condition. 
