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Page number:911 
Remarks (public):Basidiodendron cinereum, as defined, above, is characterized by the oblong to nearly subglobose basidiospores, the obovate to ovate, or even subglobose, basidia, and the fact that epibasidia are formed on some basidia. As Oberwinkler (1963) noted, those basidia that are embedded within the hymenium form distinct epibasidia (FIG. 3, E), whereas those basidia formed near the surface lack morphologically distinct epibasidia (FIG. 3, D). Older, well developed specimens generally exhibit an involucrelike sheath of collapsed basidia along the fertile hyphae, however, this sheath is often lacking in younger, thin specimens.
Basidiodendron cinereum is a typical example of the genus Basidiodendron and exhibits a considerable amount of variation in internal structure and macroscopic aspect. If the fact that B. cinereum and similar species are capable of unlimited growth laterally and vertically is accepted, specimens exhibiting these variations can be logically included within the concept of a single species.
The thick, tropical forms that dry to a conspicuous white crust, which were included by Wells (1957) within the concept of Bourdotia cinerea, are now excluded from the definition of B. cinereum. Although these tropical forms obviously belong to Basidiodendron, they are tentatively assigned to Sebacina stratosa (Viegas) Olive. Also, we haven't included Basidiodendron rimosurn ( Jacks. et Martin) Luck-Allen within the concept of B. cinereum as did Wells (1957) .
Although the number of collections on hand of B. cinereum from the U.S.S.R. is limited, those available are widely distributed. Others (Bourdot and Galzin, 1928 ; Olive, 1958; Oberwinkler, 1963 ; Luck-Allen, 1963; Reid, 1970) have reported that the species is widespread in both tropical and temperate zones.
Description type:Non-original description 
Description:Basidiodendron cinereum (Bres.) Luck-Allen, Canad. J. Bot. 41 : 1043. 1963. FIG. 3
Sebacina cinerea Bres., Fung. Tridentini 2: 99. 1892.
Thelephora cinerea (Bres.) Sacc. et Syd., in Sacc., Syll. Fung. 16: 183. 1902.
Exidiopsis cystidiophora Hoehn., Ann. Mycol. 3: 323. 1905. Sebacina murina Burt, Ann. Missouri Bot. Gard. 13 : 337. 1926. Sebacina gloeocystidiata Kuehner, Botaniste 17: 26. 1926. Bourdotia cinerea (Bres.) Bourd. et Galz., Hymen. France, p. 49.
Basidiocarps waxy to coriaceous-waxy, effused, adnate, grayish hyaline ; upon drying forming a thin, cinerous to ochraceous-gray layer, surface porous-reticulate to continuous, often pruinose; in section 25200 µm, consisting of a narrow, prostrate hyphal layer composed of thin-walled, often indistinct hyphae, 2-3.5 µm in diam, and an ascending layer of gloeocystidia and fertile hyphae ; in some specimens 2 or more growth strata present, each composed of prostrate and ascending layers; gloeocystidia abundant, hyaline, becoming yellow-granular and
FIG. 2. Basidiodendron cremeum. A, B. Segments of fertile hyphae. C, D. Basidia. E. Basidiospores. F-I. Gloeocystidia. All drawings from TAA 7148. FIG. 3. Basidiodendron cinereum. A. Segment of fertile hypha (TAA 12100). flexuous, often retaining an apical staining dome, subcylindrical or subfusiform, sometimes with a knoblike base, (15-)20-45(-100) x (3-)5.5-10(-13) µm; dikaryophyses very sparse, simple to little branched, arising from the fertile hyphae, rarely extending beyond the developing basidia, 1-2 µm in diam ; fertile hyphae tortuous, 1.5-4 µm in diam, bearing basidia in clusters at the apex, in thicker specimens collapsed basidia forming an involucrelike sheath along the axis; hypobasidia ovate to obovate, less often subglobose, guttulate, usually with 4 segments, with obscure basal clamp connections, (12-)14-18 (-20) x (9-)10-15(-16) µm; epibasidia present or absent, cylindrical, tapering gradually apically into subulate sterigmata, 2-4 µm in diam at base, up to 15 (-25) µm in length ; basidiospores oblong, broadly elliptical, broadly ovate and adaxially depressed, to subglobose, guttulate, (8-)10-12(-13) x (5.5-)6.5-9 µn1, capable of germinating by repetition.
On decaying angiosperm and coniferous wood. Known from North and South America, Europe, U.S.S.R., Society Islands, Marshall Islands, New Zealand.
Type locality.-Trento, Italy.
Illustrations.-Kuehner, R. 1926. Botaniste 17 : pl 1, Figs. 1-12 ; Bourdot, H., and A. Galzin. 1928. Hymen. France, p. 49, Fig. 26 ; Rogers, D. P. 1933. Stud. Nat. Hist. Iowa Univ. 15: 25, Figs. 4-6; McGuire, J. M. 1941. Lloydia 4: 38, Figs. 91-94; Christiansen, M. P. 1959. Dansk Bot. Ark. 19 : 21, Fig. 14 ; Oberwinkler, F. 1963. Ber. Bayer. Bot. Ges. 36 : 44, Fig. 5 ; Luck-Allen, E. R. 1963. Canad. J. Bot. 41 : 1042, Figs. 36A-46 ; McNabb, R. F. R. 1966. New Zealand J. Bot. 4: 534, Fig. 1, o-r; Reid, D. A. 1970. Trans. Brit. Mycol. Soc. 55: 425, Fig. 2, d-f.
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