1917] HOTSON—BULBIFEROUS FUNGI 271 
in form, 100-250 u, occasionally elongated to 350 in diameter, 
produced in fluffy aerial clusters; primordium one or more short 
lateral branches twining spirally about the main branch. No other 
means of reproduction at present known. 
On horse dung, Kittery, Maine; Seattle, Washington; St. Louis, Missouri. 
The original material from which pure cultures of this fungus 
were obtained was found on a horse dung compost at Kittery, 
Maine, by Dr. Tuaxrer. It has since been found by the writer 
on similar material in the vicinity of Seattle; also on material sent 
from St. Louis, Missouri, by S. M. ZELLER. In the last instance 
the bulbils apparently were produced after the horse dung compost 
had been used as a fertilizer on mushroom beds. This fungus has 
never been found on any other substratum than horse dung. It 
has been grown on different media in pure cultures for 6 years 
without inducing it to produce any other fructification than bulbils. 
_ The mycelium is white, 3-5 u in diameter. It is usually pro- 
cumbent, but when cultures are left in such a position that the 
hyphae can grow straight downward they grow out into the air, 
producing long streamers or festoons which attach themselves to 
the opposite side of the test tube. 
_ The bulbils of P. byssina resemble those of Grandinia crustosa, . 
7 but the two species can easily be distinguished by the prominent 
liut n of the latter. Even the general ae 
appearance of the mycelium i in cultures i is sufficient to distinguish © 
them, Grandinia producing a) Cae tee et 1s, . i“ oe 
Strands of hyphae which radiate conspicuously in all directioan ae 
from the point of inoculation.” This phenomenon is entirely Boe 
absent in P. byssina. The cells composing the bulbils are homo- 
geneous throughout. In this respect ‘they resenible those | of 2 o 
