Zeller: Development of Stropharia Ambigua 145 
6. Peck, Chas. H. New Species of Fungi. Bull. Torrey Club 25 : 325-326. 
1898. 
7. Peck, Chas. H. New Species of Fungi. Bull. Torrey Club 22: 204. 1895. 
Description of Plates CXXIV and CXXV 
Photomicrographs by Homer O. Blair and photographs by the author. 
Fig. 1. Young carpophore undifferentiated; X 30. 
Fig. 2. Young carpophore with hymenial primordium developed, but no 
evidence of the primordium of the pileus ; X 30. 
Fig. 3. Young carpophore showing the hymenial primordium farther de- 
veloped than in Fig. 2 and the appearance of the primordium of the pileus ; 
X 3 °. 
Fig. 4. From same young carpophore as Fig. 3 ; the primordium of the 
hymenium showing the beginning of the gill cavity ; X 300. 
Fig. 5. Part of young carpophore showing the gill cavity ; the primordium 
of the hymenium continues to develop as the margin of the pileus continues 
to grow ; young lamellae in longitudinal section ; partial veil of loose filaments : 
and cortex of the stem; X 30. 
Fig. 6. Tangential section of young carpophore showing young lamellae 
in cross section ; the lightly staining central portion is the trama ; cystidia ; 
X 30. 
Fig. 7. Greater magnification of the same lamellae as shown in Fig. 6, 
showing the trama, hymenium and cystidia with large spherical nuclei ; X 300. 
Fig. 8. Tangential section of more mature pileus and lamellae ; the trama 
of the pileus ; superficial viscid layer ; trama, subhymenium and hymenium of 
the lamellae ; X 60. 
Fig. 9. Pileus of carpophore showing small flocculent patches of the 
universal veil and the partial veil completely covering the lamellae. Nat. size. 
Fig. 10. Carpophore showing partial veil ruptured leaving annulus and 
partly appendiculate. Nat. size. 
Fig. 11. Same object as Fig. 10 with part of pileus cut away to show 
annulus. Nat. size. 
Fig. 12. Dried specimen (Zeller, No. 91) showing annulus. Nat. size. 
