CHROMOGENIC FUNGI WHICH DISCOLOR woop. 113 
B. Colonies at first gray, later brown or black, conidia dark colored, 
borne in branched chains in clusters from upright hyphae, 
HORMODENDRON. 
Velvety colonies, yellow-green at first, then olive to black. 
H. cladosporioides. 
Furry colonies, light to dark gray, finally almost black. H. griseum. 
C. Colonies yeast-like at first, mucilaginous, finally turning brown or 
black. HorMIscIum. 
Mycelium cream-colored, then brown, conidia dimorphous, chlamy. 
dospores present, HI, gelatinosum. 
D. Colonies gray, green, yellow or red, conidia hyaline or slightly 
colored, borne in clusters of simple chains from branched upright 
hyphae. PENICILLIUM. 
Mycelium dimorphous, lemon-yellow to orange in one form, gray or 
blue-green in the other; staining wood yellow or red. P. aureum. 
Mycelium white or pink to red; staining wood crimson. 
; P. roseum (2) 
E. Colonies white, often changing to red or lilac, microconidia one- to 
two-celled, macroconidia several celled, fusiform or sickle-shaped. 
FusARIUM. 
Staining wood pink, red, or purple, or even brown in old cultures, 
F. roseum, 
EXPLANATION OF PLATES. 
The illustrations are from camera lucida drawings by the 
author except for pl. 6, f. 7, 8, drawn by Miss Laura 
L. Eames. Throughout, perithecia and their tips, and 
stromata, are enlarged 50 diameters; and mycelial struc- 
tures, conidiophores, conidia, and ascospores are enlarged 
500 diameters. 
Plate 3. — Ostiola of Ceratostomella. 1. C. capillifera. 2. C. exigua. 
3. C. echinella. 4. C. minor. 5. C. moniliformis. 6. C. Schrenkiana. 
7. C. pluriannulata. 8. C. pilifera. 
Plate 4.— Ceratostomella Schrenkiana. 1, 2. Conidial clusters. 3. 
Ascospores. 4. Young perithecium, with conidiophores from some of 
the older hyphae.— C. pilifera. 5,6. Conidial clusters. 7. Germinat- 
ing conidia. — Cephalosporium-like aggregations are shown in figures 1, 
5, and 6. 
Plate 5. — Ceratostomella pluriannulata. 1. A conidial cluster. 2. 
An ascus and ascospores.— C. moniliformis. 8. Conidial clusters. 4. 
A moniliform chain of conidia formed like arthrospores, two conidia 
germinating. 5. A. Cephalosporium-like aggregation of conidia termi- 
8 
