Fig. 2. 
PuLatTe XVIII. 
Fig. 1—A 3-week’s old culture of Polyporus pargamenus secured by 
transferring oidia from a culture on malt extract agar to a new plate of 
the same medium, two-thirds natural size. The mycelial growth resulting 
was indistinctly zonate and again broke up into oidia. 
Fig. 2.— A 3-week’s old culture of Polyporus pargamenus on malt extract 
agar secured by transferring to a plate a portion of the agar containing yel- 
lowish mycelium from an old oidial growth. The mycelial tissue trans- 
ferred quickly developed into a brownish hydnoid hymenium while an 
oidial growth spread over the agar from this nearly to the side of the dish. 
