FUNGI OF IMPORTANCE IX THE DECAY OF TIMBERS. 31 
with deep pores. Brefeld (<5, p. 106) reported in Trametes serialis 
aerial oidia which would germinate and made the observation that 
their formation occurred only on young mycelium, never on old. 
The writer's cultures have developed no oidia. The oidia and 
chlamydospores in Lenzites trabea have not been reported. No 
secondary form has been noted in Fomes roseus. Chlamydospores 
have been seen in cultures of Lenzites sepiaria, but have been scarce. 
They could not have appeared abundantly in Falck's cultures, for 
he little more than mentions them. All his references to secondary 
spore production by this fungus are to the oidia, and he describes no 
physiological tests upon the chlamydospores. 
Oidia have appeared to a limited extent in the submerged my- 
celium of Lenzites sepiaria, chiefly in the hanging agar drop cultures 
(PI. Ill, figs. 3 and 10), while the aerial oidia have been quite abun- 
dant with some variations (PI. Ill, figs. 4-7; and PI. VIII, fig. 1). 
Oidia have been quite abundant also in wood cultures. What little 
aerial mycelium forms on either wood or agar breaks up almost en- 
tirely to oidia. The occurrence and method of formation has been 
described sufficiently by Falck (7-5, pp. 139-140). He describes pri- 
mary, secondary, and tertiary oidia according as they are formed on 
primary, secondary, or tertiary mycelium. The secondary oidia 
are never formed on the natural substrate of the fungus, according 
to him. but abundantly on agar, while the whole superficial growth 
of tertiary mycelium on agar or wood forms oidia in moist air. 
Chlamydospores and chlamydosporelike bodies (PI. Ill, figs. 12 and 
13) are found in small numbers upon the submerged mycelium. The 
secondary mycelium of Lenzites trabea develops oidia in abundance 
(PI. IV, fig. 2) and chlamydospores in fair numbers (PI. IV, figs. 3 
and 4). The oidia are formed on the superficial mycelium and the 
chlamydospores on the submerged so far as can be determined. 
Some of the latter spores are thin walled and appear much like 
rounded oidia. Many of the chlamydospores show the contraction 
of the protoplasm and the abandoned cross walls (PL IV, fig. 4), 
as in the chlamysdospores of Trametes serialis and Lentinus lepideus. 
The chlamydospores of Trametes serialis (PI. IV. figs. 6, 7, 8; and 
PL VIII, fig. 2) have appeared regularly in the writer's cultures 
and fairly abundantly. They are found for the most part on the 
submerged mycelium, although sparingly in the aerial fruiting my- 
celium at the upper end of older agar slant cultures, where abortive 
fruit bodies are formed. The method of development is that de- 
scribed by Lyman for other basidiomycetes (31, p. 150, pis. 1§, 21, 
and 22) and illustrated in Plate IV, figure 6, and Plate VIII, figure 2. 
The chlamydospores of Lentinus lepideus (PL V, figs. 4 and 5) 
ihave never been found abundantlv. Thev occur in a living condition 
