A STUDY OF DEVELOPMENT IN THE GENUS CORTINARIUS 333 
DESCRIPTION OF PLATES VIII-XIII 
Figs. 10, II, 18, 31, 44-49, and 61 were taken with a Bausch and Lomb compound 
microscope, fitted with a Zeiss 4 mm. ocular and 4 mm. objective. In fig. 64 an 18 
mm. oc. and 16 mm. ob. were used. The other figures were photographed by means 
of an extension camera and Zeiss lenses, figs. 12, 13, 14, 15, 16, 17, 23, 39, 40, 41, 42, 
43, with a 35 mm,, figs. 52, 53, 54, 55, 58, 59, 60 with a 50 mm. and the others with 
a 16 mm. Spencer Lens Co. photographic objective. 
Cortinarius anfractus (figs. 1-18) 
Fig. I. X 34 diameters. Early stages of three fruit bodies. The one on 
the left is still undifferentiated, excepting for a darker layer on the outside, which 
is possibly protoblem. The two older fruit bodies show an area of active growth 
within, organizing stem and pileus primordia. 
Fig. 2. X 34 diam. A slightly older stage. Median section showing the 
primordia of pileus, hymenophore and stem. 
Fig. 3. X 34 diam. Median section of an older stage. The primordial 
stage is changing into the palisade layer. 
Fig. 4. X 34 diam. Tangential section of the fruit body of fig. 3. 
Fig. 5. X 34 diam. Median section of a fruit body with the palisade layer 
well developed. The outer and inner regions of blematogen are shown and the gill 
cavity is just beginning to form. On the top of the basidiocarp the blematogen 
has become consolidated with the surface of the pileus and forms a firm cortex. 
Fig. 6. X 34 diam. Tangential section of same, near the stem. 
Fig. 7. X 34 diam. Tangential section of same, beyond the stem. 
Fig. 8. X 34 diam. Older stage, the last to show the palisade layer before 
the formation of gills. 
Fig. 9. X 34 diam. Tangential section of same. 
Fig. id. X 250 diam. The hymenial region of fig. 3, showing the hymeno- 
phore primordium on a larger scale. 
Fig. II. X 250 diam. An enlargement of Fig. 8, showing the well-developed 
palisade layer. 
Figs. 12-16. X 14 diam. A series of sections, showing the various stages in 
the development of the gills. Fig. 12 represents the median section. The others 
are all cut parallel to it from the same fruit body. 
Fig. 17. X 14 diam. A section of a nearly mature fruit body, showing the 
persistent blematogen. 
Fig. 18. X 250 diam. An enlargement of the young salients of fig. 15 to 
show the narrow growth zone, subadjacent to the salients. The very abundant 
nuclei show prominently. 
Cortinarius armillatus (figs. 19-24) 
Fig. 19. X 34 diam. Youngest stage obtained. The button has begun to 
differentiate into a central growth region, probably the stem fundament, and an 
indefinite blematogen. The outside darker layer probably represents modified 
blematogen. 
