EXPLANATION OF PLATES 



The colored plates are from drawings made by the late Dr. William Cod- 

 man Sturgis; the half-tone plates are from photographs made by the author. 

 The general colors given for the black and white photographs are those of 

 specimens used. They may be different in other collections of certain species. 

 Variations from the colors are mentioned in the descriptions of species. 



Plate 1 



The upper photograph shows a pile of short, decaying logs on an estate 

 at Mill Neck, Long Island, from which many species were taken at different 

 times. When such a pile is discovered, frequent visits should be made, and if 

 fruiting bodies appear on the outside, the pile should be taken apart and every 

 log carefully examined. Some species prefer a particular wood; others develop 

 on the lower sides of logs; and others again are close to the ground or on leaves 

 beneath or near the lower logs. It is a mistake to examine a wood-pile casually. 

 It may hold a number of rare species and will repay a careful search. 



The lower photograph shows the forest at Albertson, near Mineola, Long 

 Island, with Mr. Rispaud at work on a stump. A dead tree, broken off and 

 fallen like the one in the background sometimes has unusual forms near the 

 top which cannot be seen from the ground while the tree is standing. We 

 have broken down many dead trees in our experience. The stumps, together 

 with surrounding mosses and leaves, are often prolific sources, particularly in 

 wet areas. 



Plate 2 



Figs. 1-3. Physarum megalosporum (p. 62). Fig. 1, sporangia X 12. 

 Fig. 2, part of the capillitium with spores and showing typical lime-knots of 

 the genus X 350. Fig. 3, spores paler on one side X 750. 



Figs. 4-6. Didymium fulvum (p. 132). Fig. 4, sporangia and plasmo- 

 diocarps X 12. Fig. 5, part of the sporangial wall with capillitium and spores, 

 and showing the characteristic lime-crystals of the genus X 350. Fig. 6, 

 spores paler on one side X 750. 



The drawing was made by Dr. W. C. Sturgis from the type material of 

 the two species (N. Y. B. G. nos. 12805, 11338). The plate was reproduced in 

 half-tone in Mycologia 9: pi. 14, 1917, but the magnifications given in the ac- 

 companying descriptions are not correct. The half-tone plate is smaller than 

 the drawing, and it seems no corresponding adjustments were made in the 

 magnifications, which were apparently intended for the drawing. Other slight 

 errors in the magnifications have been corrected by comparison of the figures 

 with the actual specimens. 



Plate 3 



Comatricha lurida (p. 159). FiG. 1, a group of sporangia on a leaf X 6. 

 Fig. 2, a single sporangium with the capillitium free of spores X 55. FiG. 3, 



301 



