DESCRIPTIONS OF THE PLATES. 



413 



DESCRIPTION OF PLATE XI. 



Sphaleromyces occidentalis Thaxter. 

 Fig. 1. Mature individual. A 12. 



Sphaleromyces Lathrobii Thaxter. 



Figs. 2, 3. Mature individuals. A 12. 



Fig. 4. Younger individual, more highly magnified. D 4. 



Fig. 5. Spore. D 4. 



Fig. 19. Terminal portion of appendage of a young individual, showing three antheridia and 

 spinous process. T ^ 4. 



Compsomyces verticillatus Thaxter. 



Fig. 6. Mature individual : the two basal cells unusually elongate, the branch from the stalk of 

 the perithecium somewhat abnormal. A 12. 



Fig. 7. Mature individual, normal form. A 12. 



Fig. 8. Mature individual developing a second perithecium at the right. A 12. 

 Fig. 9. Young individual, showing young perithecium and its very highly developed spirally 

 twisted trichogyne. A 12. 



Fig. 10. A young perithecium with much less highly developed trichogyne. D 12. 

 Fig. 11. Perithecium enlarged, showing prominences. D 4. 



Fig. 12. Perithecium seen in optical section with contained ascus mass before any spore discharge 

 has occurred. D 4. 



Fig. 13. Peculiar modification of basal cell of receptacle. D 4. 

 Fig. 14. Portion of appendage with lateral antheridia. D 12. 

 Fig. 15. Two spores. D 4. 



Mbschomyces insignis Thaxter. 



Fig. 16. Mature individual with four perithecia, two of which are shown in optical section with 

 their spore masses, that at the left showing lateral view of ascogenic cell at its base, the other showing 

 the round tips of the numerous asci. The cellular haustorium is shown projecting through a fragment 

 of the soft chitinous integument of the host torn off when the fungus was removed. A 12. 



Fig. 17. An ascus with eight ascospores ; its stalk partly broken off. Leitz oil T ' ? 4. 



Fig. 18. One of the masses of coherent spores discharged from the perithecium. D 4. 



Fig. 19. See above sub Sphaleromyces Lathrobii. 



Chcetomyces Pinophili Thaxter. 



Figs. 20, 21. Two mature individuals. A 12. 

 Fig. 22. Spore. D 4. 



Rhachomyces speluncalis Thaxter. 



Fig. 23. Mature individual, the receptacle apparently proliferous. A 12. 

 Fig. 24. Mature individual typical form. A 12. 

 Fig. 25. Antheridium. D 4. 



Fig. 26. 



Moschomyces insignis Thaxter. 

 Portion of fertile appendage with branchlet terminated by an antheridium. J 4. 



