1917] HOTSON—BULBIFEROUS FUNGI 281 
spiral primordium of P. coprophila and the flocculent and abundant 
mycelium differ widely from those of P. magnifica. The bulbils 
of P. magnifica more closely resemble those of P. parasitica (Kar- 
sten) Hotson than they do those of P. coprophila. However, in 
P. parasitica, which is described as parasitic on beets in the original 
description by Karsten, the mycelium is flocculent, the bulbils 
15-21 w in diameter, with a single large central cell invariably 
present, and the primordium a spiral which coils crosier fashion. 
Thus, the procumbent and scanty character of the mycelium of 
P. magnifica, as well as the size and mode of development of the 
bulbil, readily distinguish it from P. parasitica. In order to obtain 
further information regarding the relationship of these two fungi, 
inoculations were made in the roots of growing beets and turnips, 
both in the field and in the laboratory. In each case a small slice 
of the root was removed with a sterile knife and a cavity made in 
the cut surface. From a pure culture of P. magnifica a portion 
of the nutrient agar containing bulbils and mycelium was gouged 
out and deposited in this cavity. Over this a small piece of — 
glass was put and the soil replaced. Although several similar 
experiments were carried on, no indication of a parasitic condition 
could be detected. 
Other species that resemble the two just mentioned, such as 
_ Physomyces heterosporus (Monascus heterosporus [Harx] Schréter), oo 
Dendryphium bulbilferum Zukal, Acrospeira mirabilis Berk. and 
Br., etc., have al discussed (6), so that it is not necessary 
to repeat the discussion. , 
Key to species of bulbiferous fungi 
__ There are several more or less well defined characteristics that 
_are made use of in making the following key for the members of t 
. a form genus Papulospora. A broad division sexily made on the ae 
