334 
GERTRUDE E. DOUGLAS 
Fig. 20. X 34 diam. Slightly older stage showing considerable increase in 
the central growth region. The layer of loose tissue on the outside probably repre- 
sents a protoblem. 
Figs. 21 and 22. X 34 diam. Median and tangential sections of a fruit 
body in which the palisade layer is developed. 
Fig. 23. X 14 diam. Median section from a nearly mature specimen, showing 
the duplex character of the blematogen and the strands of the marginal veil being 
torn by the tension in growth of the hymenophore and pileus margin. 
Fig. 24. X 34 diam. A section showing mature primary gills, and forking 
caused by the development of secondary salients at their bases. 
Cortinarius cinnamomeus (figs. 25-50) 
Fig. 25. X 34 diam. Median section of earliest stage obtained. The pileus 
fundament is evident as a deeply stained saucer-like area near the top of the button. 
The blematogen consists of the loose tissue upon the surface. 
Fig. 26. X 34 diam. A slightly older fruit body, showing the beginning of 
the hymenophore primordium. 
Figs. 27 and 28. X 34 diam. Median and tangential sections of an older 
stage. The palisade layer is in the process of formation. 
Figs. 29 and 30. X 34 diam. An older fruit body, showing the gill cavity. 
Fig. 31. X 250 diam. An enlargement of the paHsade layer and gill cavity 
of Fig. 29. 
Figs. 32-38. X 34 diam. A series of sections at various intervals between 
the central axis of the stem and the margin of the pileus, showing the origin of the 
gills. Note the fibrillose character of the pileus surface in fig. 32. 
Figs. 39-43. X 16 diam. Stages in the formation of the gills of an older 
specimen. The secondary gills are beginning to form. 
Fig. 44. X 250 diam. An enlargement of the margin of fig. 39, showing the 
pseudoparenchymatous cortex and fibrillose surface of the pileus. 
Figs. 45-49. X 250 diam. Stages in the development of a secondary gill. 
Fig. 45 is nearest the margin. As the sections approach the center, they show pro- 
gressive stages of maturity. 
Fig. 50. X 34 diam. Nearly mature primary and secondary gills. 
Cortinarius lilacinus (figs. 51-62) 
Fig. 51. X 34 diam. Median sections through a tubercle, showing the differ- 
entiation of the stem fundament in the center. 
Figs. 52 and 53. X 11 diam. Median and tangential sections of an older 
specimen, showing the pileus, hymenophore and stem primordia. 
Figs. 54 and 55. X 8 and 11 diam. resp. Older specimen, showing the 
organization of the palisade layer. 
Figs. 56 and 57. X 34 diam. The palisade layer and gill cavity, just before 
the development of the gills. 
Figs. 58, 59 and 60. X 11 diam. Sections of the youngest fruit body to 
show gill formation. 
