302 Mycetozoa of North America 



part of the columella with attached capillitium X 315. FiG. 4, group of 

 spores X 410. FiG. 5, group of spores X 880. 



The drawing was made by Dr. W. C. Sturgis from authentic material 

 collected in England and supplied by Mr. Arthur Lister (N. Y. B. G. no. 11866). 



Plate 4 



Lamproderma muscorum (p. 172). FiG. 1, a group of sporangia on a leaf 

 X 20. Fig. 2, a single sporangium free of spores X 85. Fig. 3, upper part of 

 columella with capillitium X 250. Fig. 4, group of spores X 750. 



The drawing was made by Dr. W. C. Sturgis from material collected by 

 Mr. Joseph H. Rispaud and the author at Seventh Lake, Adirondack Moun- 

 tains, New York (N. Y. B. G. no. 3465). 



Plate 5 



Enteridium minutum (p. 217). Fig. 1, an aethaUum on wood X 20. 

 Figs. 2, 3, portions of the pseudo-capillitium X 350. FiG. 4, group of spores 

 X 350. Fig. 5, group of spores X 750. 



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

 (N. Y. B. G. no. 11314). 



A similar plate was reproduced in half-tone in Mycologia 9: pi. 15, 1917, 

 but the magnifications given in the accompanying description 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 specimen. 



Plate 6 



Figs. 1, 2, one third natural size. Photographs of yellow plasmodia 

 derived from sclerotium in the laboratory. Sclerotium is the inactive, hard- 

 ened, resting stage of the plasmodium, into which it enters with the advent 

 of cold weather, and remains until revived by warm rains. Sclerotium may be 

 obtained during the winter months from very rotten logs with holes or large 

 crevices where it often forms large masses, or beneath the logs. In the more 

 solid logs the sclerotium may be thinly spread and not discernible. Suitable 

 logs should be noted during the summer months by the indication of fruiting 

 bodies, as many logs are barren. To obtain plasmodium Irom sclerotium, a 

 flat dish with cover is prepared with several layers of neutral filter paper, which 

 should be wetted and kept moist at all times. Rain or spring water is best, 

 but tap water will do equally as well if not chlorinated. Ordinary room tem- 

 peratures are sufficient. A small piece of the sclerotium is placed on the wet 

 paper, and in three or four days the revived plasmodium will appear. It must 

 then be fed to enable it to live and grow. Ordinary dried corn, ground in a 

 small mill or mortar to a fine powder is a good food. It should be sprinkled 

 sparingly over the paper with a fine sieve, and repeated every few days. In 

 time the waste will foul and destroy the plasmodium unless removed by careful 

 washing with a little water poured over it and then drained away. Many 

 interesting observations may be made on the plasmodium and its animal-like 



