Bulletin . - are pink, in others some shade of yellow or rust-color, in others purple-brown, and in still others they are black. Asingle spore of any mushroom is too small to be seen with the nakedeye, but when a sufficient mass of them is obtained the color can readilybe recognized. If the stem is removed from a fresh mushroom andthe cap is placed, gills down, on a sheet of paper and covered withan inverted tumbler the spores will fall to the paper in great numbers,and within an hour or so an impression of the gill surface, consistingentirely of spores, will be formed on the paper. Such an im
Bulletin . - are pink, in others some shade of yellow or rust-color, in others purple-brown, and in still others they are black. Asingle spore of any mushroom is too small to be seen with the nakedeye, but when a sufficient mass of them is obtained the color can readilybe recognized. If the stem is removed from a fresh mushroom andthe cap is placed, gills down, on a sheet of paper and covered withan inverted tumbler the spores will fall to the paper in great numbers,and within an hour or so an impression of the gill surface, consistingentirely of spores, will be formed on the paper. Such an impressionis called a spore print (Fig. 2). One of the first things to do, then,when the genus of a species is in doubt, is to make a spore print todetermine the color of the Fig. 2. Spore print of Collyhia radicata. Use of the Key In the key to the gill fungi on page 437 the genera are arranged incolumns according to the spore color, and in the first column someother differences between genera are tabulated. Suppose now that onour first collecting trip we find a cluster of orange-colored proljably have seen the same kind before but we do not know itsname. We at once cut the stem from one specimen and place the cap,gills down, on a piece of white paper and invert a tumbler over it. If wecan spare another specimen we arrange it in the same way on a pieceof black paper. Then with a specimen in hand, we turn to the the l^cginning of the key we find, I. Flesh vesiculose, and three 4^7 M m o 1=1 ^ ft ft o o IS o s ftp +^ c ft P3 DO o +-» a! _oo Ph o 03 .2o S^ ^^ cd cd o ft Sh O C o 05 l=ift O C S O o ?- tJ >i 2 !^ O c3 ;is i;- o ft 3o S o E oo oft02 .2 s rt =» 0) ft be ft ^ T- C S ?- Si; ft o °^ ^ ^ ft ^ ^ ^ >^p S O ri ijO 5 o o .n
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