1236 Wisconsin Academy of Sciences, Arts and Letters. 
This tiny species is not difficult to determine. Macbride’s 
description is adequate. 
Our specimens are from near Fond du Lac July 1897; Olin’s 
drive, Madison, July 1904; Vilas woods, July 1904; and Blue 
Mounds, July 1904. 
Tilmadoche viridis (Bull.) Saccardo. 
1791. Sphaerocarpus viridis Bulliard, Champ., t. 407, fig. i. 
1880. Tilmadoche viridis (Bull.) Sacc., Michelia II., p. 263. 
Macbride: ‘‘Sporangia globose, flattened or lenticular, beneath 
plane or concave, variously colored, yellow, greenish yellow, rusty 
orange, stipitate, nodding; the peridium splitting irregularly or 
reticulatelyJ stipe variable in length and color, through various 
shades of red and yellow, subulate: eapillitium strongly devel¬ 
oped, concolorous with sporangium, the tubes with colorless or 
yellow calcareous thickenings; spores smooth, fuscous or violet 
black, 8a. A very handsome and rather common little species, 
like T. alba , but generally greenish yellow in color, and occasion¬ 
ally brilliant orange without a suggestion of green. ” 
Lister adopts the name Physarum viride Perg. He finds the 
sporangium w r all dehiscing in fragments; the stalk slender subu¬ 
late, striate, grey or straw-colored, sometimes yellow at the 
apex shading to red below, usually brown in the lower half; 
eapillitium a loose irregular network of slender, acutely 
branching hyaline threads, with fusiform orange lime-knots. 
Spores brownish violet, almost smooth, 7-10/a in diameter 
Massee calls this species T. mutabilis Rost. He describes the 
sporangium wall as having a thin layer of yellow, dingy orange, 
or greenish colored particles of lime; eapillitium rather dense, 
with small elliptical nodes containing colored granules of lime; 
he finds the spores minutely verruculose, 9-11/a in diameter. 
This tiny species seems to be quite common, and is easily 
determined. I found no essential differences from the descrip¬ 
tions given. 
We have twenty-one collections, the sporangia growing on 
dead wood or bark. The dates of collection range from 1901 to 
1905, and from June 22 to October 21. The most are from 
Madison and vicinity, but we have specimens from Mauston, 
Algoma, Palmyra, and Blue Mounds. 
