﻿124 BOTANICAL GAZETTE [February 



the fundamental plectenchyma on the surface of the stem. Since 

 the gill origins are more or less adnate to the stem in different 

 individuals, sections parallel with the axis of the stem and passing 

 through these origins on the apex of the stem, in the angle between 

 pileus and stem, may lead to error in the interpretation of the gill 

 origins, since the trama, arising here from the stem as well as from 

 the pileus, is attached to both. The sections then present pockets 

 or "stalls," with the palisade layer converging toward their centers. 

 As soon as the sections pass beyond the portions arising from the 

 stem apex, the relation of the gills to the pileus presents the normal 

 appearance. 



In Coprinus micaceus, because of the weak, general gill cavity, 

 isolated hyphae and loose strands remain attached here and there, 

 not only to the gill origins but to the portion of the hymenophore 

 between them in the early stages of the salients, or gill origins. 

 The palisade layer of the hymenophore is continuous over their 

 margins, but very soon the marginal cells swell into globose or 

 broadly clavate cystidia, and by the crowding of these cells the 

 margins of the gills spread laterally, or fan-tail. The protoplasmic 

 content in the marginal cells being thus diluted, the margin of the 

 gill does not stain deeply. The gill margins soon press against the 

 thin layer of fundamental plectenchyma on the surface of the stem. 

 There is an interlocking of hyphae and also an interwedging of the 

 marginal cells of the gills and trama with the surface cells of the stem. 



6. The cystidia have not been thoroughly examined in this 

 study, since they did not come within the limits of the special prob- 

 lem undertaken at this time. Furthermore, their thorough study 

 would require examination also of material in the fresh condition, 

 at the time of the separation of the gills from the stem. But it has 

 been observed that many at least of the cystidia in Coprinus 

 atramentarius arise from cells of the trama beneath the sub- 

 hymenium. 



Cornell University 

 Ithaca, N.Y. 



LITERATURE CITED 

 i. Allen, Caroline L., The development of some species of Hypholoma. 

 Ann. Mycol. 4:387-394- fis. 5-7. 1906. 



