1922] LUPO—HYPOXYLON 495 
The writer wishes to express appreciation and thanks to Pro- 
fessor C. J. CHAMBERLAIN, under whose direction the study was 
made; and to Mrs. Ftora Patterson for identifying the material. 
RocKkFrorp COLLEGE 
RockForpD, Itt. 
EXPLANATION OF PLATE XVIII 
Fic. 8.—Early stage of coil in section, showing nuclei already increased in 
size; X1 : 
I sudepehiok view of pd pie same stage, including several cells 
with aa of original size; 1562. 
IG. 10.—Later stage of perithecium with wall yet loosely formed: large 
backeasar Woronin “hyphae in center of perithecium; X 1562. 
IG. 11.—Still later stage with compacted wall and growth toward pe- 
riphery started so that ascogonia lie relatively nearer bottom: a, large nucleated 
ascogonium; 0b, ascogonia of irregular shape and stalklike connection left with 
what was original coil; c, nunca mature ascogonium; d, hyphae 
eae in size and datnten rating: X15 
GS. 12a, 13.—Beginning stages in pene & of ascogonia to form 
ascogenous hyphae; 1562. 
