168 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
patches surrounding or in the immediate neighborhood of Aegerita 
fructifications. These patches spread and become confluent, finally 
forming an effused area which is, however, never of great extent. 
The thickness is so slight that when dry the hymenium is easily over¬ 
looked, and it often appears like a subiculum on which rest Aegerita 
sporodochia. Cystidia are scattered, few in number, and appear 
only in well developed hymenia (pi. 20, fig. 44). 
Peniophora Candida (Persoon) Lyman. 
Thin, inseparable from the substratum; commencing as small patches 
with indeterminate margin, which soon become confluent and form effused 
areas. Hymenium very minutely velvety; white or pearl-colored, often 
becoming faintly cream-colored. Cystidia scattered; cylindrical or atten¬ 
uated upward; 5-8 p X 40-60 p. Spores globose or ellipsoidal with a small 
apiculus; 5X6 p-Q.5 X 8.5 p, average 5.8 X 7 p; containing from one to 
many refractive guttulae of varying size. 
Imperfect form is known as Aegerita Candida Persoon (Syn. meth. fung., 
p. 684, 1801). Sporodochia crowded, granular; subglobose to egg-shaped 
or short-cylindrical; sessile, superficial, usually with a delicate, whitish 
subiculum; pure white when fresh, turning yellowish and sometimes greenish 
when old and dry; at first glabrous, then becoming minutely mealy with 
the numerous conidia; 0.1-0.25 X 0.15-0.35 mm. Conidiophores hyaline; 
short, rather thick, wavy, irregularly branched, forming a loose spongy tissue. 
Conidia hyaline; globose, ellipsoidal or pear-shaped; 7X9 /i-10 X 15 p; 
terminal and solitary, or rarely in chains of two or three; forming a close, 
nearly smooth layer which gives the sporodochium the appearance of having 
a cellular cortex. 
Host .— On pieces of pine boards, and fallen branches of Alnus, Populus, 
Acer, etc., in w r et places; the hymenium is always accompanied by the coni- 
dial form. 
Aegerita Candida is found widely distributed in North America and Europe, 
also in Ceylon. Thus far the perfect condition has been reported only from 
Cambridge, Massachusetts, and Hanover, New Hampshire. 
Germination of basidiospores .— Germination takes place readily in 
from 24 to 36 hours, the spore producing one or sometimes two germ 
tubes without appreciable enlargement (pi. 20, fig. 46). The hyphae 
are hyaline, non-granular, vacuolate, and branch freely, but the 
branches normally arise some distance below the septa, not immedi¬ 
ately below, as is the rule with most of the other Hymenomycetes 
studied. The mycelium is at first devoid of clamps, but on the 
fourth or fifth day after germination these begin to develop and 
