CONTROL OF DECAY IN PULP AND PULP WOOD 65 
Stemphylium sp. — Culture green-black, reverse jet-black; myce- 
lium decumbent, hyaline to brown, scanty; conidiophores decumbent, 
irregularly branched; conidia large, muriform, very dark brown, 
mostly ovoid. (See PL XVI, fig. 21.) The brown hyphaB intertwine 
the fibers, producing olive-black areas in the infected pulp. The 
large, dark spores are frequently found in " sooty" spots. Isolated 
from soda pulp. Common. 
Altepnaria sp. — Culture velvety, pale to deep olive gray, reverse 
black; mycelium hyaline to brown; conidia obclavate, muriform, 
brown, single or in chains (12 spores have been observed in one 
chain) at the ends of conidiophores which vary but little from the 
regular hyphse (PL XVI, fig. 20) ; chains sometimes branched. This 
species produces small, round, brown spots in ground wood. Isolated 
from ground wood (32019-2). Common. 
Unidentified Dematiaceae. — Mycelium hyaline becoming brown, 
often in heavy decumbent strands. 
1 . Cultures dark olive gray or grayish olive to mouse gray, reverse 
black; conidiophores short, rarely branched, brown at base to sub- 
hyaline or hyaline at roughened tip (PL XX, iig. 2) ; conidia fusoid 
or ellipsoid, subhyaline to hyaline. Agar red-brown or normal; pulp 
gray. Isolated from ground wood (3818-1, 82219-5). Very common. 
2. Cultures mouse gray, drab, or dark snuff brown, reverse brown- 
black; mycelium downy, cottony, or fluffy to feltlike; conidiophores 
branched or unbranched, lateral branches of ordinary nyphae, hyaline 
to light brown, ends open to form a " collar" which is slightly flaring 
(PL XVI, fig. 6) and concolorous with conidiophore, bell shaped and 
dark brown (PL XX, fig. 3) or widely flaring, saucer shaped and dark 
brown (PL XX, fig. 4) . Conidia borne singly at tips of conidiophores, 
held together in heads; hyaline, subhyaline, or light brown; ovoid, 
ellipsoid, or globose. Agar normal or bleached; pulp dark neutral gray, 
olive gray, or brown-black. Isolated from ground-wood (81318-1, 
10910-7, 82219-18, 82219-2) and sulphite pulp. Very common. 
3. Cultures olive brown to black, or mouse gray to dark grayish 
olive, reverse black; hypha3 dark brown, frequently coiled; conidio- 
phores Penicillium-like, dark brown at base to hyaline at tips of final 
branches; conidia globose, small, hyaline, borne in chains at tips of 
conidiophores. Agar normal ; pulp dark neutral gray. Isolated from 
ground- wood (82219-9, 82219-23) and sulphite pulp. Very common. 
4. Culture soggy, appressed, cream to cinnamon; hyphae hyaline; 
conidiophores short, rigid, septate, brown below branches, branched 
irregularly, tips hyaline; conidia hyaline, ovoid or ellipsoid, borne in 
short chains at tips of conidiophores. Agar normal; pulp cinnamon. 
Isolated from sulphite pulp. Kather common. 
5. Cultures deep olive gray, reverse brown; mycelium hyaline or 
brown, sometimes in strands, not superficial; conidiophores short, 
rigid, brown at base, hyaline toward tips, branched in irregular whorls; 
conidia oidia-like, in chains at tips of conidiophores, hyaline. Agar 
slightly darkened; pu]p olive gray. Isolated from sulphite pulp. 
Common. 
TUBERCULARIACEAE 
Fusarium sp. — Mycelium scanty, hyaline to light brown; chlamy- 
dospores brown, rough, globose; conidia mostly one or two celled. 
(See PL XVI, fig. 17.) Agar red; pulp orange vinaceous. Isolated 
from sulphite pulp. Observed once. 
523°— 25t 5 
