﻿A TKINSON—COPRINUS 



section through the stem (parallel with its axis) in figs. 46 and 47. 

 Fig. 46 is from a section near the middle of the stem, while fig. 47 

 is near the surface of the stem at its junction with the hymenophore, 

 but still including a considerable portion of the stem at this place. 

 The young lamellae in fig. 47, therefore, are cut somewhat obliquely, 

 but the margins present their relative position in relation to the 

 gill cavity and the fundamental plectenchyma below clothing the 



Four serial sections beginning near the margin of the hymeno- 

 phore and traveling toward the stem are shown. Fig. 52 is near 

 the margin of the young hymenophore, and shows not only the 

 palisade layer of the same but the general gill cavity preceding the 

 origin of the lamellae. In fig. 53 the first evidence of the salients or 

 fundaments of the lamellae are seen, resulting in a slight undulation 

 of the palisade surface of the young hymenophore. A few of the 

 stray hyphae extending across the general gill cavity are con- 

 nected with some of the gill salients, while others are connected 

 with the portion of the hymenophore between the salients. Above 

 a few of the salients the hyphae of the trama are lighter colored 

 because of their lessened protoplasmic content resulting from their 

 elongation, which assists in pushing down the salient. In fig. 54 

 the salients or ridges are still more prominent. Portions of loose 

 threads from the shredded fundamental plectenchyma below are 

 loosely connected with some of the salients, and others with the pali- 

 sade portion of the hymenophore between them, especially the 

 younger portions at either side of the section. Fig. 55 represents 

 a still older stage of the young lamellae. In this section the margins 

 of the lamellae show a feature which is quite characteristic of the 

 very young lamellae of C. micaceus. This is the lateral spreading 

 or fan-tailing of the margin, caused by the outward curving of the 

 hyphae, and particularly by the swelling of the marginal cells into 

 subglobose or pyriform bodies, which is probably largely responsible 

 for this fan-tailing of the young gill margins. These swollen cells 

 form cystidia. 



As the lamellae become broader they press more and more upon 

 the loose fundamental tissue beneath. The swollen cells on the 

 margin of the young lamellae, pressed against the loose tissue 



