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BOTANICAL GAZETTE 



22. Levine, M., The origin and development of the lamellae in Coprinus 

 micaceus. Amer. Jour. Bot. 1:343-356. pis. 39, 49. 1914. 



23. Zeller, S. M., The development of Stropharia ambigua. Mycologia 

 6:139-145- ph. 124, 125. 1914. 



EXPLANATION OF PLATES V-XII 

 PL VI is not reduced; the other plates are reduced as follows: pi. VII to 

 H of the diameter of the photomicrographs; pis. IX, X, and XI to f; 

 pis. V, VIII, and XII to f. Magnifications are given in connection with 

 descriptions of figures. The photomicrographs were made by the author, 9 of 

 them with Spencer Lens Co. 16 mm. photo lens and Zeiss camera, the remainder 

 with Zeiss microscope and Leitz simple camera stand. 



PLATES V-VII 



Figs. 1-25. — Coprinus comatus. 



Fig. 1. — One side of section of upper end of young basidiocarp before 

 formation of annular gill cavity and young hymenophore; constriction at right 

 indicates delimitation of pileus and stem; no internal differentiation apparent, 

 but radiating system of threads marks blematogen; X30. 



Fig. 2. — Another basidiocarp representing an older stage, the section being 

 median or nearly so, and parallel with axis of stem; annular cavity, therefore, 

 present in section as two cavities, one on each side of stem; deeply staining 

 tissue above cavity is young hymenophore before formation of palisade layer; 

 p, pileus; b, blematogen; X30. 



Fig. 3. — Tangential section from same basidiocarp in which annular gill 

 cavity shows as a transversely elongated opening a few threads of the shredded 

 tissue extending across; X30. 



Fig. 4.— Tangential section of another basidiocarp parallel with axis of 

 stem; annular gill cavity showing as transversely elongated cavity; palisade 

 layer not yet formed over any portion of surface, and surface still in frazzled 

 condition, resulting from tearing apart of fundamental plectenchyma ; funda- 

 ment of hymenophore indicated by more deeply staining tissue above at each 

 side; X50. 



Fig. 5.— Left side of fig. 4 more highly magnified; X80. 



Fig. 6.— Still more highly magnified detail of frazzled roof of cavity in 

 another section from same plant; loose hyphae of fundamental plectenchyma 

 below; X500. 



Fig. 7. — One side of median longitudinal section of a basidiocarp in which 

 palisade layer is forming; blematogen at right; young palisade hymenophore 

 above annular gill cavity; X50. 



Fig. 8.— Same from another section slightly more magnified; a few threads 

 from shredded tissue extending across cavity; young hymenophore above; dark 

 area at right represents surface of pileus, with blematogen at its right; X80. 



Fig. 9.— Tangential and longitudinal section of same basidiocarp just 

 passing out of stem surface with some frazzled fundamental plectenchyma on 



