132 
Mycologia 
sibly be due to the association of photogenic bacteria or other 
light-producing organisms. 
It is impossible to give an accurate and complete list of the 
more conspicuous luminescent fungi, and some of the names re- 
corded in the literature are very probably synonyms. Among 
North American species, the following have been reported to 
have the power to produce light, either in the mycelium or in 
some part of the fruit-body. 
Armillaria mellea (Vahl) Quel. 
Ceriomyces crassiis Batt. 
Clifocybe illudens (Schw.) Sacc. 
Collybia longipes (Bull.) Quel. 
Cotlybia tuberosa (Bull.) Quel. 
Corticium coeniletim (Schrad.) Fries 
Forties annosus (Fries) Cooke 
Laefiporus speciosus (Batt.) Murrill 
Panus sfypticus (Bull.) Fries 
Polyporus caudicinus (Scop.) Murrill 
Porodaedalea Pini (Thore) Murrill 
Xylaria Hypoxylon Pers. 
To the above preliminary and very incomplete notes, may be 
added a few simple observations made on Clitocybe illudens, the 
most conspicuous of our luminescent species. The writer has 
frequently collected the beautiful orange hymenophores in New 
York, Virginia, North Carolina, and other states, and almost in- 
variably they have been found to be luminous. On August 21, 
1911, at 8 a. m., I collected about two bushels of the hymeno- 
phores of this species from an old oak stump in a low, shady 
woodland east of Bronx Park and brought them to my office in a 
large basket covered with fresh ferns. Several specimens, in- 
cluding wood containing the mycelium, were taken into the dark 
room at 8 130 a. m., but they exhibited no luminosity. At 10 a. m., 
a large cluster was first tried in the dark room, then exposed to 
dififused sunlight for an hour, and afterwards heated to 90° C. in 
7 minutes in a drying oven, and at no time did it become luminous. 
At 1 1 a. m., a cluster was immersed in cool water and left there 
20 minutes, but this did not make it luminous. The water, now 
colored pale-orange, was tested in the dark room, but showed no 
luminosity. It was not to be expected that either the dissolved 
