THE DEVELOPMENT OF SOME SPECIES OF AGARICS 
Plate VIII 
Figs. 31-47. Clitocyhe adirondackensis. 
Fig. 31. A median longitudinal section of a young basidiocarp. It repre- 
sents the primordial stage at which time it is composed of a loose weft of wavy, 
slender, and homogeneous hyphae. X 32. 
Fig. 32. A median longitudinal section which shows the pileus primordium 
at the apical end, differentiated from the stipe primordium. The apical threads are 
spreading and serve as an arbitrary line of demarcation between the areas of the 
two primordia. X 32. 
Fig. 33. A median longitudinal section showing further development of the 
pileus and stipe. By continued growth of the central primordial hyphae umbonate 
pileus is produced. Between the margin of the pileus and stipe an area of densely 
staining hyphae is shown. This is the h^^menophore primordium which develops 
centrifugally as the pileus continues to grow. X 32. 
Figs. 34, 35. A median longitudinal section of later stages. The pileus has 
increased in thickness but the expansion is comparatively little. Since the mar- 
ginal hyphae elongate more rapidly than the central ones the pileus becomes plane. 
The hymenophore primordium develops at the same time, advancing toward the 
margin of the pileus and stains more deeply. X 32. 
Fig. 36. An oblique transection through the upper portion of the stipe. The 
lower part of the figure shows a portion of the surface of the stipe beneath the 
hymenophore. To the left and above this region is a portion of the palisade layer. 
The remaining peripheral portion shows the folding of the palisade layer and the 
development of the gill salients. X 32. 
Fig. 37. Cross-section of the extreme lower portion of the pileus, show- 
ing the general habit of the gills and manner of development. X 32. 
Fig. 38. A tangential section through the pileus and near the stipe, show- 
ing the decurrency of the lamellae and also the incurving of the pileus margin. 
X 32. 
Fig. 39. A tangential section midway between the margin of the pileus and 
stipe. It shows the thickness of the pileus and the nature and general direction 
of the gills. Some are connected at their base which is chiefly the result of branching. 
X 32. 
Fig. 40. A median longitudinal section, showing the general habit of the 
plant. The pileus is plane and the gills extremely decurrent. 
Fig. 41. A high magnification of a young basidiocarp, showing in longi- 
section the structure of the primordial condition. A homogeneous weft of wavy, 
slender threads which converge at the apex. X 230. 
Fig. 42. A median longitudinal section, showing the apical hyphae growing 
outward. This is the pileus primordium. X 300. 
Fig. 43. A median longitudinal section, showing the hymenophore pri- 
mordium. This is composed of the ends of hyphae which have their origin in the 
stipe and pileus elements. The margin of the pileus curves down over the surface. 
Thus, the marginal hyphae add new elements to the hymenophore regions, both of 
which develop centrifugally. X 300. 
Fig. 44. A cross-section through the basidiocarp near the apex of the stem 
