Studies in Entomogenous Fungi. T. Petch. 109 
from the side, appears to be interrupted by a deep narrow sinus 
(Plate V, fig. 8 6). Viewed from the convex edge, two auricles 
are seen, projecting one on either side at the base (fig. 8 a), 
while, from the concave side, it is seen that the two sides of 
the structure fold together and nearly meet above, but separate 
again widely near the base (fig. 8 c). 
The wall of this structure is thin, continuous, and hyaline, 
and is composed of parallel hyphae, about 3 » diameter, united 
side by side in a continuous sheet, and joined laterally by ladder 
connections. Within it, at the base, there is a very minute 
parenchymatous mass of hyaline cells, from which a few un- 
branched conidiophores arise, but no conidia have been found. 
A comparison of figs. 8 and 20, Plate V, will make it clear 
that these thorns are the walls of the conical tips of the Pseudo- 
microcera, and their structure supports that interpretation. But 
they are not Pseudomicrocera sporodochia from which the conidia 
have disappeared, as the base is practically entirely lacking. 
For some reason, only the wall of the tip has been developed, 
and that has taken the form of a hyaline membrane. They 
appear to have grown on very small specimens of Aonzdia. 
It may be noted that the tendency to produce scarious mem- 
branes is well-marked in most of the fungi which grow on scale 
insects. It occurs, for example, in Aschersonia and Hypocrella, 
where the stroma is often surrounded by a scarious hypothallus ; 
and one may meet with the same hypothallus, indiscriminately, 
in gatherings of Sphaerostilbe and Microcera. 
SPHAEROSTILBE. 
Sphaerostilbe coccophila Tul. 
This species was first described by the Tulasnes in Selecta 
Carp. Fung. I, p. 130 (1861), where they cited the specimens 
Microcera coccophila Desm., Desmaziéres, Plantes Cryptogames 
de France, Ed. 11, Ser. 1, No. 1350 as the conidial stage, and 
Rabenhorst, Fungi Europaei Exsicc., Ed. nov., Ser. secunda, 
Nos. 262 and 269 as the perithecial stage. Rabenhorst 262 had 
been issued as Nectria episphaerta Tode, and 269 as Microcera 
coccophila Desm. 
The description was repeated in Selecta Carp. Fung. 111, 
p. 105, where Rabenhorst 262 only is cited for the perithecial 
stage, but Desmaziéres, Plantes Cryptogames de France, Ed. 1, 
Ser. 1, No. 1750 is added to the former citation for the conidial 
stage. 
Desmaziéres 1350 and 1750 were collected near Caen (Nor- 
mandy) and Rabenhorst 262 and 269 at Florence, Italy. 
According to the Tulasnes’ description, their species forms a 
