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Page number:289 
Description type:Non-original description 
(Figs. 39-45, 53)
Trans. Brit. Myc. Soc. 73:18, 1979.
This species has been described by Lowe (1966:123), Ryvarden (1979:18) and Ryvarden &, Johansen (1980:554). CULTURE STUDIED: n°415: Argentina, Misiones, Nat'l Park Cataratas del IguazÀº, leg. M. Rajchenberg M-3487, 1.111.82 =BAFC 27963.
GROWTH CHARACTERS: growth very rapid, 7.5 cm/7 days, covering the plate in 2 wk. Margin regular. Mat white, irregularly felty or loosely woolly with subfelty zones in the margins and turning tightly felty in the margin in the last weeks (Fig. 53). As from the 2nd wk red zones develop in the margins or the center of the plates under the mats, at first light orange (11 & 9) becoming dark purplish to almost vinaceous, and colouring the mycelium. Odor faintly sweet or fungic. Reverse unchanged, with chestnut reddish zones (Chrysantemum 5 L 12, Indian Red 6 A 12) corresponding with those of anverse. Oxidase reaction in GAA: ++++ , 10 ; in TAA: ++ , 0 ; in TyA: - , 90 ; in pCA: - , 0 ; with GG: +
MICROSCOPIC CHARACTERS: Advancing mycelium formed by simple clamped thin-walled generative hyphae, infrequently branched, with constrictions, 3.6-7.8 µm wide (Fig. 39).
Aerial mycelium formed by (a) simple clamped thin-walled generative hyphae, poorly to regularly branched, narrow to wide, 2.1-8.3 µm (Fig. 40); (b) skeletal hyphae, thick-walled and branched, 0,8-2,6 µm wide (Fig. 41); (c) arthrospores cubic to prismatic, 3.1-13.0 x 1.6-2.1 µm (Fig. 42); (d) simple clamped, slightly thick-walled generative hyphae without cytoplasmic contents, 4.2-6.2 µm wide (Fig. 43); and (e) free crystals in agar. Submerged mycelium forming a pseudoparenchyma just under the agar surface and the felty mats, formed from the 3rd wk on by very deformed cells, irregularly widened and swollen and with thickened walls (Fig. 44). Reddish zones formed by a plectenchyma formed by generative hyphae with chestnut thickened walls, skeletal hyphae and much modified branched swollen hyphae withthickened walls, all of them tightly interwined and embedded in an amorphous extracellular substance that reddens the medium (Fig. 45).
SPECIES CODE: 2a. 3. 8. 10. 11. (21). 35. 36. 37. 39. 40. 42. 50. 54.
REMARKS: growth and microscopic features plus similar species codes point out a notable relationship between Tinctoporellus epimiltinus (Berk. &, Br.)Ryv. and Grammothele
subargentea (Speg.) Rajch. (see p.282), which differs principally in lacking a pseudoparenchyma in culture. Ryvarden (1979:18) related Tinctoporellus Ryv. to Antrodia Karst. (=Coriolellus Murr.) which differs radically in having generative hyphae with irregularly thickened walls (at least in culture), hyaline skeletal hyphae and producing a different rot (brown) in substrata. With Grammothele subargentea this species shares a similar hyphal system (with simple clamped thin to slightly thick-walled generative hyphae and yellowish to chestnut skeletal hyphae with dextrinoid reaction), producing a white rot in substrata, and dyeing the substratum with red-oxide tints (though in T. epimiltinus the coloration is always evident and widespread and in G. subargentea it is hardly seen only in the limits of the rot). Both genera differ in the following characters:
Tinctoporellus Grammothele
Spores subglobose to broadly ellipsoid Spores cylindric
Hymenophore distinctly tubular, 1- several layered Hymenophore grammotheleoid to tubular
Dendrohyphidia absent Dendrohyphidia present

Cultural features were surprisingly similar between Tinctoporellus epimiltinus and Grammothele subargentea, principally in the capacity to redden the agar, form a plectenchyma, produce quite abundant mycelium, and similar growth and oxidase reactions. In conjunction with the morphological features a relationship can be established between both taxa. Sexual and cytological studies are highly needed to confirm this hypothesis.
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