OLIVE: STRUCTURE OF BOTRYORHIZA HIPPOCRATEAE 341 



EXPLANATION OF PLATE VIII 



AH 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 i,ooo diameters. 



Botryorhiza Hippocraleae Whetzel & Olive 



Fig. I. 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. X 500. 



Fig. 2. Branching hypha, showing the binucleate cells, whose walls in some 

 places show peculiar thickenings. X 500. 



Fig. 3. Young haustorium, containing 4 nuclei. Note the invagination of the 

 host cytoplasm. 



Fig. 4. Another haustorium, pushing into a mass of dense, granular host 

 protoplasm. 



Fig. 5. A fully mature haustorium, showing its botryose lobings. 



Figs. 6 and 7. Haustoria in partial section; showing the pushing in of host 

 protoplasm. 



Fig. 8. A young hypha from the hymenium, showing the constricting wall 

 cutting off stalk from spore. X 1,500. 



Fig. 9. A young spore, with two nuclei. 



Fig. 10. A young spore in which the two nuclei have just fused, as evidenced 

 by the presence of two nucleoles. 



Figs, ii and 12. Mature teliospores, showing binucleate stalks. 



Fig. 13. A spore showing young germ-tube. 



Fig. 14. Another spore, with growing basidium, or promycelium. The 

 nucleus is in metaphase of the heterotypic division; but the preparation is poorly 

 stained. 



Figs. 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. 



Fig. 18. Two basidiospores, showing the uninucleate condition. 



