Lloyd Mycological Writings V4.pdf - MykoWeb

CONTEXT AND PORES WHITE OR PALE.
light, spongy. Pores very large, irregular, 1-3 cm. long, 2-3 mm. wide,
light tissue, concolorous with the flesh. Spores 8-10 mic., hyaline,
smooth, with large guttae.
Fig, 666.
Polyporus obtusus.
This is a remarkable species not rare in portions of the United
States. It generally grows on living black oaks, causing a heart rot
that eventually kills the tree. It is said not to infect the white oaks
or red oaks. This fungus is noteworthy for its soft, spongy flesh, light
weight, and large pores. We have never seen it growing, but we
think fresh specimens are more yellow than the dried ones.
Polyporus obtusus was most probably the plant that Schweinitz
called Sistotrema spongiosum, changed by Fries to Polyporus labyrinthicus,
of which no specimen exists. It is found in Schweinitz's
herbarium as Polyporus unicolor, but does not agree with his description
of unicolor. The first specimen to reach Europe was collected
by Drummond (near New Orleans, probably), and named in ms.
by Klotzsch as "Polyporus Drummondii Klotzsch," but is not the
plant published under that name. Berkeley published it as Polyporus
obtusus. The plant is not infrequent in the United States in sections
where the black oak grows. In Europe it is not surely known, though
we should here refer a specimen collected in Hungary by Kmet, which
was referred to Polyporus Schulzeri, and probably is Polyporus
Schulzeri according to the poor picture that Kalchbrenner gave of it.
It has never been collected in western Europe. In the New York
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