22 BULLETIN 1053, IT. S. DEPARTMENT OF AGRICULTURE. 



quite abundantly throughout the flasks. The mycelium of Lentinus 

 lepideus covers the individual blocks with a bunchy, uneven growth, 

 Avhile that of Trametes serialis forms a thick, even growth over the 

 whole mass of blocks. Yet the mycelium of the former fungus binds 

 the blocks quite solidly together, so that it takes some little effort 

 either to remove individual blocks from the flask or to loosen the 

 mass for emptying the flask, while the more pronounced mycelial 

 growth of Trametes serialis does not have such a binding effect. The 

 aromatic odor mentioned is much more pronounced in the flask block 

 cultures; the other four fungi here studied do not produce such an 

 odor. 



MICROSCOPIC CHARACTERS OP THE MYCELIA ON MALT AGAR. 



Lenzites sepiaria: 



Secondary mycelium- 

 Submerged. 



Colorless, avellaneous in mass ; 1.5 to 4.6 (i?, most 2.5 to 3.2 fi ; 

 septa fairly abundant ; branching not abundant ; clamps not observed ; 

 chlamydospores and oidia found occasionally on submerged mycelium, 

 the latter chiefly in agar drop cultures. 

 Aerial. 



Colorless ; chiefly short, branched hyphse which break up more or 

 less completely to oidia ; size same as submerged ; septa fairly 

 abundant ; no clamps observed. Oidia colorless, mostly ellipsoid- 

 oblong, occasionally ellipsoid, ovoid, globose, pyriform, or clavate, 

 occasionally septate ; terminal oidia usually clavate ; 2.5 to 3 fi X 

 4 to 35 n ; helicoid hyphse present, but not abundant. 

 Tertiary mycelium (aerial) — 



Seldom noted in the writer's single-spore cultures. In cultures from 

 sporophores, more abundant; long, stiff, hairlike, sparingly branched, 

 septa not abundant, clamps at septa. 

 Lenzites trabea: 



Secondary mycelium — 

 Submerged. 



Colorless ; 1.5 to 3 j»; irregular ; branching, clamps, and septa 

 abundant ; chlamydospores much less abundant than the oidia, thin 

 or thick walled, terminal or intercalary, ovoid to globoid, 6 to 8 X 

 8 to 18 n. 

 Aerial. 



Colorless ; 1.5 to 3 n ; branching common, usually at right angles ; 

 clamps and septa fairly abundant ; oidia abundant, mostly cylindrical 

 to ellipsoid-oblong, terminal ones ovoid to pyriform and clavate or 

 even globoid, 2 to 8 X 6 to 24 n, mostly about 5 X 10 p. 

 Tertiary mycelium (aerial) — 



Colorless, slightly yellowish in mass ; long, straight, and stiff ; branch- 

 ing and septa not abundant; clamps fairly abundant; no oidia or 

 chlamydospores observed. 



* The figures in these descriptions refer to the range of measurements observed during 

 ordinary examination. 



