14 BOTANICAL GAZETTE [JANUARY 
tissue. There is here, however, an additional organ, or part of 
the fruit body, which lies within the primordial tissue, leaving a 
thin layer of primordial tissue next to the stem and one next the 
pileus. This is the indusium (J), which in this species is composed 
of chambered, pseudoparenchymatous tissue differentiated from 
and within the primordial tissue and not extending down into the 
tissue at the base. The remnant of primordial tissue here is exactly 
homologous with that which we have just observed in I. impudicus 
and P. ravenelii. In this figure there is seen the thin, white mem- 
brane or veil which lies between the indusium and the stem, and 
which is continuous with the more massive area of primordial 
tissue below. The remnant of primordial tissue between the 
pileus and indusium is in this specimen, at this point, very thin, 
but it: is present and can be seen extending around below the mar- 
gin. of the indusium to join the other branch where the two veils 
or membranes pass into the mass of primordial tissue below. 
Fig. 12 is of a longitudinal section from J. impudicus at the upper 
end of the fruit body, the lettering as before. Here we should 
note the inner and outer layers of the main part of the pileus, which 
in the section stain as dark lines in contrast to the looser tissue of 
the trama between. The inner wall of the pileus can be here traced 
upward as a very distinct dark line. For want of space, the entire 
photograph is not reproduced here, the upper portion being cut 
away; but the pileus above curves over and is joined with the 
margin of the stem apex. Between the pileus and the stem is seen 
the primordial tissue, the ‘‘veil.’”’ A very interesting: structure 
is present here. Through the middle of the primordial tissue, 
parallel with the surface of the pileus and stem, but separated from 
them on either side by primordial tissue, is a darker line, repre- 
sented by slightly denser tissue which stains darker than that on 
either side. This is the indusium rudiment described earlier in the 
study of the development of the young fruit bodies, and it is quite 
remarkable that this rudiment should persist within the veil up 
to the maturity of the fruit body, so that it can be recognized in 
microscopical preparations. It does not continue to the apex of 
the stem along with the membrane of primordial tissue, but ends 
a short distance below at the projecting ring in the stem correspond- 
