PLATE 20 



Fig. 1. Fungal threads attacking cortical cells of the pine. The threads force their way between and 

 over the pine cells which are the unshaded areas in the figure. X 690. 



Figs. 2 and 3. Basidia with nearly mature spores. 



Fig. 4. Young basidia. X 1290. 



Fig. 5. Mature spores. X 1290. 



Fig. 6. Tramal thread, showing nuclei. X 1290. 



Fig. 7. Trama and hymenium of mature plant, some of the basidia with two, others with four sterigmata. 

 X 1290. 



Figs. 4-6 stained to show nuclei. 



