It is most frequently found growing on the tops of hills or benches and slopes of hills, from gravelly to loamy and pulverulent clay soil.
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Zippeite is a hydrous potassium uranium sulfate mineral with formula: K4(UO2)6(SO4)3(OH)10·4(H2O). It forms yellow to reddish brown monoclinic- prismatic crystals with perfect cleavage. The typical form is as encrustations and pulverulent earthy masses. It forms as efflorescent encrustations in underground uranium mines.
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The fungus white sporocarps measure by , and have a central strand of filamentous hyphae. The surface is pulverulent—as if covered with a fine white powder. There are no basidia, basidiospores, nor clamp connections present in the hyphae. The fungus produces arthrospores, specialized uninucleate cells that function like a spore and formed vegetatively.
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Pollination is probably myiophyllous, even though Tetracentron shows a clear anemophilous syndrome. The pulverulent seeds are dispersed by the wind (anemochory). Trochodendron is present in both protandrous and protogynous forms that are self-compatible. The plants are found in wooded formations, Trochodendron between 300 m and 2.700 m above sea level and Tetracentron between 1.100 m and 3.600 m above sea level.
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Rutherfordine is a mineral containing almost pure uranyl carbonate (UO2CO3). It crystallizes in the orthorhombic system in translucent lathlike, elongated, commonly radiating in fibrous, and in pulverulent, earthy to very fine-grained dense masses. It has a specific gravity of 5.7 and exhibits two directions of cleavage. It appears as brownish, brownish yellow, white, light brown orange, or light yellow fluorescent encrustations.
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The physical description is as follows: The cap is 25–65 mm wide, plano-convex to plano-depressed, buff, non-viscid, with a striate margin. The volval remnants are pulverulent on the center raised into wart- like peaksor warts or radial ridges, colored pale sepiAmanita. Gills are crowded and free, measure 6–7 millimeters wide, and appear white to pale buff. The short gills are subtruncate.
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The type location, and its namesake, the Sugar Loaf Islands off Taranaki, New Zealand, is an example of a coastal occurrence. Taranakite forms small white, pale yellow, or gray crystals, which are typically found in pulverulent nodular aggregates, or crusts. Taranakite crystallizes in the hexagonal system, and is noted as having the longest crystallographic axis of any known mineral: the c-axis of the taranakite unit cell is 9.505 nanometers long.
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The cap of Amanita flavorubens is 35 – 105 mm wide, yellow to brassy yellow to lemon yellow, sometimes dark orange brown, sometimes with pigment entirely washed out by rain becoming pallid, sometimes very deep wine red in its entirety due to bruising during development (Coker 1917), subovoid to hemispheric to plano-convex to convex, depressed in the center, slightly tacky to dull to subviscid to subvelvety, with an incurved or downcurved, rimose, and nonstriate margin (may become slightly striate with age). It is adorned with conspicuous, woolly to felty, yellow warts; bald underneath the warts; the margin not lined, or only faintly lined at maturity. The volva is present as yellow to orange to bright orange- yellow flocculent to confluent warts, friable, sparsely and irregularly distributed, easily removable, pulverulent, splotchy brown around the center, yellow at the edge. The flesh is 3 – 7 mm thick over the stem, thinning evenly to the margin, white or yellowish, bright yellow just under the cap skin. The gills are free to very narrowly adnate, subcrowded to crowded, creamy ivory to cream to off-white, 3 – 8 mm broad, with a white pulverulent edge and also a small decurrent tooth.
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The classical heavy liquids like 1,1,2,2-tetrabromoethane (Muthmanns solution), potassium tetraiodomercurate(II) (Thoulets solution), bromoform or diiodomethane which are used in mineralogy are very toxic. These toxic chemicals are avoided today in consideration of the fact that there are alternative water based, non-toxic heavy liquids like sodium polytungstate solutions.Callahan J, A non-toxic heavy liquid and inexpensive filters for separation of mineral grains, in Journal of Sedimentary Petrology, 57/1987, S.765-6 With this relatively new heavy liquid densities up to 3.1 g·cm−3 can be adjusted . Adding parts of pulverulent Tungsten carbide increases the density to 4.6 g·cm−3.
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The specimens of Pulveroboletus bembae upon which the species description is based were collected in April, 2008 from three locations in Gabon: in Ogooue-Ivindo Province at the Ipassa-Makokou Research Station; in the Minkébé National Park near Minvoul, and in Bitouga, both locations in the northerly province of Woleu-Ntem. Until the report of this species and the related Pulveroboletus luteocarneus, 12 species of Pulveroboletus had been reported in tropical Africa. According to Degreef & De Kesel, who described the species in a 2009 publication, P. bembae belongs to the section Pulveroboletus of the genus Pulveroboletus. This section, defined by Singer in 1947, is characterized by the presence of a pulverulent-arachnoid veil (covered with fine, powdery wax granules and cobwebby) and fruit bodies that are sulphur-yellow, greenish, or yellowish-brown in color.
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