Life history of a new species of Sphaeretla 
193 
pycnospores colorless, long, slender, flexuous, 35—56 x 2—3 g., conti¬ 
nuous or 1 — 4 septate. “Spermatia” produced in “spermogon^^ or in- 
the pycnidia in late autumn, 4—5 x 1 g. 
Pycnidial stage parasitic in leaves of Prunus pennsylvanica, asco- 
genous stage saprophytic in leaves of the same host. 
Peritheciis amphigenis, gregariis vel sparsis, nigris, immersis, 
punctiformibus, ovatis, 90—110 x 45—85 g; ostiolis prominulis; ascis 
cylindricis, aparaphysatis, 35—45 x 7 g., octosporis; sporidiis, hyalinis, 
fusoidiis, 16—21 x 2,5—3 g, 1 septatis. 
Hab. in foliis dejectis Pruni pennsylvanicae. 
Status conidicus:maculis primum glaucis dein brunneis, 2—5 mm 
lat., interdum dejectis; pycnidiis amphigenis, immersis, globosis; spori¬ 
diis hyalinis, filiformibus, flexuosis, 35-36 x 2—3 g, continuis aut 1—4 
septatis; spermatiis autumno in spermogoniis. 
Hab. in foliis vivis Pruni pennsylvänicae. 
Summary. 
A new disease of Prunus pennsylvànicâ caused by the pycnidial 
stage of a previously undescribed Sphaerella is described. The perithecia 
begin to develop early in the fall often before leaf fall. A single carpo- 
gonical (?) branch is found in each young perithecium; and at the same¬ 
time “spermatia” are produced in pycnidia-like “spermogonia”. 
The trichogyne-like part of the carpogonial structure disintegrates 
leaving only a basal cell. .Whether or not this basal cell functions as an 
ascogonium is not known; but in the spring ascogenous hyphae arise 
from a cell which occupies a position in the base of the perithecium 
similar to that occupied by this basal cell. 
The connection between the pycnidial and ascogenous stages is 
shown by similarity of cultures from the pycnospores and the ascospores 
as well as by infection experiments with pure cultures from the asco¬ 
genous stage. 
It is hoped that sufficient material for a more detailed study of the 
perithecial development may be obtained in the near future. 
The study on which this article is based was carried on in the 
Botanical laboratory of Cornell University under the direction 
of Professor George F. Atkinson, whom I take pleasure in thanking 
for careful consideration and criticism of the work. 
Mycologische Notizen über Awamori-Koji-Pilze 
(Aspergillus) und Rhizopus Delemar. 
Von K. US AMI, Fukuoka (Japan). 
(Mit 8 Figuren.) 
Über genannte Pilze liegen schon verschiedene neuere Unter¬ 
suchungen vor, meine Mitteilung bezweckt lediglich einige Beobachtungen 
wiederzugeben, die ich schon \or längerer Zeit machte, aus äußeren 
, 1 Q 
Mycologisches Centralblatt, Bd. IV. 
