Lloyd Mycological Writings V4.pdf - MykoWeb

SPORES HYALINE.
POLYPORUS TRABEUS (Fig. 638). Pileus dimidiate, sessile,
triquetrous. Surface anoderm, smooth, dull, soft, minute, pubescent.
Flesh white, soft, crumbly. Pores small, round, regular. Spores
allantoid, 1 x 4-5, cylindrical, curved.
No white species has given me more trouble to name satisfactorily
than has this common, white plant. Polyporus trabeus is our latest
decision, and in deciding on this name we are influenced mainly by
two facts. The plant is well represented in Sturm, fasc. 10, fig. 28,
which Fries cites; and it is a common plant, and Fries records it as
common. It is strange that Polyporus trabeus, which Fries states is
"frequent," should have practically passed out of current mycology.
Bresadola calls the plant Polyporus lacteus, and while we accepted it
under protest (cfr. Note 158, Letter 49), we have never been satisfied
with it. Romell, in his latest work, and Murrill, take lacteus in the
sense of Bresadola. In my belief it neither agrees with Polyporus
lacteus as to Fries' description, his figure, nor his (poor) specimen at
Kew, nor with his record of the species, in which he states it is "rare."
Polyporus trabeus is a very common plant, both in the United
States and Europe. It is very close to Polyporus albellus (see page 294),
and has the same pores and spores, but the surface has no cuticular
appearance, and is softer, hence we put them in different sections,
though we have many intermediate specimens which are hard to refer.
ILLUSTRATIONS. Sturm, fasc. 10, t. 28 very good. There is a slight pinkish cast that is
a little misleading, but the figure, to me, is characteristic. Mez' figure cited is a copy from Sturm, and
Britzelmayr is not worth considering. Patouillard t. 244 (as lacteus) represents the plant except the
flesh zone, which I have never noted.
SPECIMENS. Many from United States, and Europe, mostly referred to Polyporus lacteus
when received, also two collections (Nos. 82 and 221) from A. Yasuda, Japan, which were referred to
Polyporus albellus when received.
POLYPORUS TEPHROLEUCUS. Pileus fleshy, drying fragile,
applanate, imbricate. Surface smooth, dull, pale grey. Pores small,
round, y2 -\ cm. long, drying white. Spores l-lJ^x.4-5, allantoid,
slightly curved.
This is a fairly frequent species in Europe, and occurs also in
America. It is readily known by having white flesh and pores which
persist white, but the pileus surface is grey or dark. Fries characterized
it by villose, grey pileus and flesh at first subgelatinous. We collected
once in Sweden a single specimen that when fresh answers this
description, but the usual dry collections we have do not show them.
We have gathered it on oak in France and birch in Sweden. Fries
states it grows on pine and beech. Quelet records it only on pine.
ILLUSTRATIONS. Sturm's Flora, fasc. 10, fig. 26 (good).
SPECIMENS. Many, both from Europe and United States.
POLYPORUS ALUTACEUS. Pileus dimidiate, l/2 -\ cm. thick,
with rough, usually pale yellowish surface, sometimes spotted. Flesh
white, soft, friable. Pores minute, round, slightly alutaceous in drying.
Spores 2 x 3-4 mic.
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