140 
Mycologia 
to develop at 37° C. grew freely as soon as the temperature was 
lowered. These five strains were distributed through the luteum 
section of the group; all of the purpurogenum section grew well 
at blood heat. The arrangement of the forms in the series pre- 
sents their natural relationship as far as such relationship is 
determinable. The inclusion and placing of P. dudauxi is more 
or less arbitrary and perhaps due only to superficial evidence. 
The correlation of colors, color changes, and morphology suggest 
that the other strains may be safely grouped about P. luteum, P. 
rugulosum, P. pinophihim, and P. purpurogenum without offer- 
ing specific names at present for new species. 
Synopsis of the Series 
A}’’ Growing colonies with prominently yellow areas and reverse yellow to 
orange slowly replaced by reds — Luteum Section. 
B. Ascigerous masses found. 
a. Ascigerous masses abundant, conidial fruits few, scattered ; colonies when 
young predominantly citron-yellow to strontium-yellow (Ridgway 
XVI), becoming partially and tardily pale-flesh-color or flesh-color 
(Ridgway XIV) ; submerged mycelium and agar (reverse of col- 
ony), shading from yellow toward orange-red or red. P. luteum 
Zukal.’® Cultures No. ii from“ Prof. Thaxter, Cambridge, Massa- 
chusetts, No. 3522.3 by Dr. J. R. Johnston from Puerto Rico soil. 
aa. Ascigerous masses few, green conidial areas well developed with conidio- 
phores more or less in tufts. Yellow color predominates at edge 
and about ascigerous masses. Reverse colors from yellow toward 
orange and red. Culture, Thom, No. 2751, sent by Prof. M. T. 
Cook, from New Jersey. 
BB. Ascigerous masses not found. 
b. Colonies with sterile areas citron or strontium-yellow and conidial areas 
changing to flesh-color in age, shading with the amount of green 
conidia from sea-foam or chartreuse-yellow through citron, lime or 
chrysolite-green to densely conidial areas near ivy-green (Ridgway 
XXXI). 
c. With conidial areas in scattered tufts ; culture from rotting apple. i® Thom, 
No. 3525.95, Washington, D. C. 
cc. With large more or less irregular green areas. Cultures 3525.15 from 
rotting apples, Washington, D. C. ; Thom No. 4010.9 from Seattle, 
Washington. 
It Correlative divisions are indicated by duplication of index letters A, AA; 
c, cc, etc. 
18 P. luteum Zukal, Sitzber. K. Akad. Wiss. (Vienna) Math. Naturw. Kl. 
XCVIII, p. 521, 1889. Cultural description, Thom, C., U. S. Dept. Agr., Bur. 
Anim. Ind. Bui. ii8, p. 39. 
Organisms from rotting apples were contributed by Mr. Brooks of the 
Bureau of Plant Industry. 
