218 BOTANICAL GAZETTE [September 



5. , The development of Lepiota clypeolaria. Ann. Mycol. 12:346 



356. pis. 13-16. 1914. 



6. , Morphology and development of Agaricus rodmani. 



Proc. Amer. 



Phil. Soc. 54^309-343- pis. 7-13^ x 9i5- 



7. , Origin and development of the lamellae in Co pr in us. Box. Gaz. 



61:89-130. pis. 5-12. 1916. 



8. , The development of Lepiota cristata and L. seminuda. Mem. N.Y. 



Bot. Gard. 6:209-228. pis. 21-26. 1916. 



9. Douglas, G. E., A study of development in the genus Cortinarius. Amer. 

 Jour. Bot. 8:319-335. pis. 8-13. 1916. 



10. Moller, A., Die Pilgarten einiger slid amerikanischer Ameisen. Bot. 

 Mittheil. Tropen 6:1-127. pis. 1-7. 1893. 



11. Sawyer, W. H., The development of some species of Pholiota. Bot. 

 Gaz. 64:206-229. pis. 16-20. 191 7. 



12. -, The development of Cortinarius pholidius. Amer. Jour. Bot. 



4:5 2 °-532. pis. 28, 29. 1917. 



13. Walker, L. B., Development of Pluteus admirabilis and Tubaria fur- 

 furacea. Bot. Gaz. 58:1-21. pis. 1-3. 1919. 



EXPLANATION OF PLATES XVIII-XXII 



Figs. 1-15, 21-34, 39-46, 53-65. 68, 70-81 were taken with a Zeiss hori- 

 zontal camera and a Spencer Lens Co. 16 mm. objective; the others w r ere 

 photographed by means of a Bausch & Lomb vertical camera and Zeiss lenses. 



PLATE XVIII 



» 



Inocybe obscura 



Figs, i, 2. — Median sections of two young fruit bodies, showing differ- 

 entiation within blematogen of stipe and pileus fundaments; X34. 



Figs. 3, 4. — Median and tangential sections of older basidiocarp in which 

 hymenophore primordium and gill cavity have appeared; X34. 



Figs. 5, 6. — Median and tangential sections of fruit body, showing palisade 

 layer; X34. 



Figs. 7-10. — Series of median and tangential sections of a fruit body in 

 which young gill salients have appeared; X34. 



Figs. 11-15. — Median and tangential sections of older fruit body, showing 

 gills more strongly developed; fibrillose hyphae from pileus have replaced 

 blematogen; X34. 



Figs. 16, 19. — Details from figs. 4 and 3 respectively, showing hymeno- 

 phore primordium; X158. 



Figs. 17, 20. — Details from figs. 6 and 5 respectively, showing crowded 

 palisade layer previous to formation of gills; X 158. 



Fig. 18.— Young gill salients; detail from fig. 9; X158. 



