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Page number:933 
Remarks (internal):One of the most diagnostic characteristics of this taxon is the presence of hymenial cystidia with a melleous-colored apex, sometimes constricted. Although Murrill (1943) did not mention the presence of cystidia, they are present in the type material. Singer (1945) described the presence of the cystidia, noting the colored apex but without emphasizing it as a diagnostic character. Additional collections deposited by Singer at FH also possess these diagnostic cystidia.
This is the third of the clamped species included in this work. Phylloporus fibulatus has more abundant clamp connections and lacks the melleous cystidia. Phylloporus fibulatus has smaller spores and the surface of the pileus turns brown when exposed to NH4, in contrast to P. foliiporus that turns blue-green when exposed to NH4. Phylloporus colligatus spores also are smaller than those of P. foliiporus; the NH4 reaction is blue at first but turns burgundy, and the cystidia lack the melleous apex. The African P. pseudopaxillus has more abundant clamp connections that are seen throughout the basidiome.
Singer (1978) included P. cyanescens (Corner) Neves & Halling ined. as a synonym of P. foliiporus. However P. cyanescens has longer cystidia and the melleous contents are mostly seen in the cheilocystidia but not in the pleurocystidia. Watling and Gregory (1991) reported P. foliiporus from Queensland, Australia, however never mentioned the diagnostic cystidia or the presence of clamp connections.
 
Description type:Non-original description 
Description:Phylloporus foliiporus (Murrill) Singer, Persoonia 9:424. 1978. Figs. 10, 26
Gomphidius foliiporus Murrill, Mycologia 35:432. 1943.
Phylloporus rhodoxanthus ssp. foliiporus (Murrill) Singer, Farlowia 2:280. 1945.
Phylloporus foliiporus (Murrill) Phillips & Kibby, Mushrooms of North America, p 216. 1991. superfluous
Pileus 1.8-14.5 cm broad, at first convex, with age plane or plano-depressed, dry, even; disk subtomentose; margin even, when young dark reddish brown or maroon, then tan or ochraceous brown; surface subtomentose, becoming glabrous, with NH4 blue green. Flesh white, staining blue (when fresh and young); odor and flavor mild; with NH4 no reaction. Hymenophore lamellate, decurrent. Lamellae subdistant, not anastomosing, intervenose, forked, when young bright yellow, with age yellowish brown, staining blue; edges even. Stipe 1.6-5.5 cm long, 2-40 mm wide, equal or tapering downward, strict, dry; upper half when young finely subpruinose ridged, yellow, with age finely subpruinose ridged, grayish yellow; lower half when young floccose, olivaceous, grayish green; fibrils on upper half when young red-brown, with age light brown, on lower half when young gray-brown; base yellow, staining absent; interior solid; flesh when young whitish yellow, staining blue. Basal mycelium yellow, or pale yellow. Fleeting-amyloid reaction positive.
Basidiospores brownish olive, 10.5-12.6 µm long, 4.2-4.9 µm wide, mean Q = 2.54, subfusoid, smooth, amyloid, in KOH ochraceous. Basidia 32.2-35 µm long, 5.6-6.3 µm wide, clavate, hyaline, four-sterigmate. Hymenial cystidia 38.5-50.4 µm long, 11.9-14 µm wide, more common on sides of lamellae, thin-walled, hyaline or honey-colored contents (at the apex), fusoid or clavate, encrusting pigment present (at the apex). Hymenophoral trama bilateral; hyphae cylindrical, 7-8.4 µm wide, hyaline, amyloid. Pileipellis hyphae a trichodermium (with appressed hyphae), in KOH pale yellow or hyaline, inamyloid; inflated, encrusted with pigment (brownish cytoplasmic content), thin-walled, granular content absent. Pileus trama hyphae hyaline, inamyloid, thin-walled. Stipitipellis hyphae vertically oriented, parallel, giving rise to clusters of caulocystidia, 42.7-44.1 µm long, 12.6-13.3 µm wide, clavate, yellow. Stipe trama hyphae parallel, cylindrical, hyaline, inamyloid. Clamp connections present (rare, in the hymenophoral trama).
Mycorrhizal hosts: Pinus, Quercus.
Distribution: The species is known from Japan and from southern USA; it has been collected in Florida and recently was found in Alabama.
Material examined: United States. Florida: Alachua County, Gainsville, 31 May 1943, Singer F 2183, 8 Jul 1943, Singer F 2629; Sugarfoot Hammock, 11 Jul 1938, West, Arnold & Murrill F17747 [GenBank] (Isotype: FH);
 
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