First person to use this name on MO: Erlon Bailey
Name: Ganoderma megaloma
Author: (Lév.) Bres.
Citation: Hedwigia 53: 53 (1913)
Deprecated Synonyms: Scindalma megaloma (Lév.) Kuntze, Elfvingia megaloma, Fomes leucophaeus, Polyporus leucophaeus, Ganoderma leucophaeum, Scindalma leucophaeum, Polyporus megaloma, Fomes megaloma, Fomes applanatus f. leucophaeus, Fomes applanatus var. leucophaeus
Country (state) :
Location details : USA, New York
Substrate details : trunk
Polyporus megaloma Lév., Annales des Sciences Naturelles Botanique 5: 128 (1846) [MB#199867]
|G. megaloma||G. lobatum||Fomes fasciatus|
|Pores per mm:||5||4-5||4-5|
|Pileus:||milk-white to grey to dark brown; zonate||yellowish-brown to reddish-brown to grayish-brown; subzonate||grey to dark brown to black; strongly zonate|
|Pileus:||very hard; crust inseparable||woody; thinly crustose||hard; crustose|
|Spores:||7-8 × 5-6; smooth||8-10 × 6-7; rough||12-14 × 4-4.5; smooth|
|Range:||canada to northern alabama||southeast to new york||florida to north carolina, west to texas|
Three similar species in the eastern U.S.
Crust white, becoming brown, not separating, growing in temperate regions.
Spores smooth, 8-9 X 5
“it is near Polyporus applanatus in form, consistency and volume, but differs essentially in the color of the cap and the pores and especially in the presence of a wide sterile border circumscribing the tubes below.” http://archive.org/stream/jstor-2478555/2478555_djvu.txt
—Elfvingia megaloma (Lév.) Murrill, Bull. Torrey Club 30: 300. 1903.
Pileus hard, woody, dimidiate, applanate, 6—15 X 8-30 X 1—4 cm.; surface milk-white to gray or umbrinous, glabrous, concentrically sulcate, encrusted, fasciate with obscure lines, conidia-bearing, usually brownish during the growing season from the covering of conidia; margin obtuse, broadly sterile, white or slightly cremeous, entire to undulate: context corky, usually rather hard, zonate, fulvous to bay, 5—10 mm. thick, thinner with age; tubes very evenly stratified, separated by thin layers of context, 5—10 mm. long each season, avellaneous to umbrinous within, mouths circular, 5 to a mm., whitish-stuffed when young, edges obtuse, entire, white or slightly yellowish to umbrinous, quickly changing color when bruised: spores ovoid, smooth or very slightly roughened, pale yellowish-brown, truncate at the base, 7-8 X 5-6 um.
TYPE LOCALITY : New York.
HABITAT: Abundant on dead or diseased trunks or timber of most deciduous trees; also on conifers in certain sections.
DISTRIBUTION : Canada to the mountains of Alabama and west to California.
Exsiccati: Thum. Myc. Univ. I804 ; Rab.-Wint. Fungi Eur. 3736; Ellis, N. Am. Fungi 801 : Shear, N. Y. Fungi 34. https://books.google.com/...