1896 | THE PHALLOIDEA: OF THE UNITED STATES 285 
sheath of cortical tissue (the cortical sheath) surrounding the 
stipe for its whole length. 
The pseudoparenchyma of the walls of the stipe and of the 
arms was found connected with and arising from the tissue of 
the cortical sheath and- cortical plates. Medullary tissue from 
the main central mass was found passing into the chambers of the 
receptaculum at the base of the stipe and then passing upward 
from chamber to chamber. At the base of the arms, the 
ascending masses of medullary tissue are collected into six large 
masses, each of which is the gelatinous tissue of anarm. No 
connection could be found between the pseudoparenchyma and 
the gelatinous tissue of the chambers nor did the pseudoparen- 
chyma stand out from the sides of the chambers so as to 
indicate any such connection. 
The conclusion was reached that in A. borealis the receptac- 
ulum is formed by the joint action of both cortical and medul- 
lary tissues; that the cortical constituent develops into the 
pseudoparenchyma of the walls, and that the enclosed medullary 
bundles finally become gelatinous and disappear, thus forming 
the chambers of the wall. 
CONSIDERATION OF FISCHER’S VIEW OF THE ORIGIN OF THE 
_ RECEPTACULUM IN THE CLATHRE. 
Ed. Fischer ® has stated in his study of the development of 
Clathrus cancellatus, to which references have been made: 
1. That the fundament of the receptaculum consists of knots 
of hyphz separated from one another by small spaces. 
2. That these hyphal knots are formed from the Zwischenge- 
Hecht (in this case the tissue of the cortical plates C’ of my 
figures), 
3- That the tips of the hyphz composing the knots radiate 
Cutward from the knots into the narrow spaces between the 
knots and become constricted and abjointed into pseudoparen- 
chyma, thus forming a plate about each knot. 
4. That the tissue in the central portions of the knots 
* Ibid. 5-8. 
