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Page number:234 
Remarks (internal):Artomyces pyxidatus is the most common, widely distributed and well-known species of this genus. While variation in macroscopic characters exists, microscopic characters are relatively constant.
Measurements reported here are comparable with those reported by Corner (1950), Dodd (1972), and Wu & al. (1996).
Because of the variability of this species, there was early taxonomic confusion. Schweinitz (1831) described Clavaria coronata as a new species, but did not distinguish it from Persoon's (1794) C. pyxidata ex Fries (1821), which he included in his synopsis of the fungi of North Carolina. Clavaria petersii Berk. & M. A. Curtis was described in Berkeley (1873) as a species distinct from C. pyxidata, but without comparison to the 1atter and with no acknowledgement of C. coronata Schwein. Burt (1922) retained the three as distinct species, providing a key that emphasized slight differences in basidioma color and spore size. The next year Coker (1923) synonymized the three species under Clavaria pyxidata, expanding its circumscription to include wide morphological variability. Doty (1944), however, resurrected the name Clavaria coronata but misattributed it to what Kauffman (1930) had named Craterellus cristatus. Doty (1944) recognized C. coronata, Clavaria taxophila (Thom) Lloyd and Clavaria piperata Kauffman. Because his paper dealt with fungi of the American Pacific Northwest, C. pyxidata was not included, but he noted that it, too, was a distinct species "sensu Coker." Three years later Doty (1947) published his paper proposing the genus name Clavicorona, but apparently he changed his mind regarding Clavicorona coronata. This time he synonymized Clavaria piperata under C. coronata and recognized Clavicorona cristatus, as well as C. pyxidata and C. taxophila. Corner (1950) subsequently synonymized Clavicorona coronata and Clavaria petersii under C. pyxidata, recognized C. cristata, but suggested that C. piperata was a synonym under another species, C. colensoi. Yet again, the name C. coronata was resurrected, this time by Leathers & Smith (1967) because of its dextrinoid spores. Dodd (1972) reported that spores were amyloid and again synonymized C. coronata with C. pyxidata. Schweinitz's (1831) type material of Clavaria coronata was examined for this study, and basidiospore measurements support Dodd's (1972) assessment and taxonomic treatment.
Recent studies of the variability in basidioma morphology, culture morphology, sexual intercompatibility, phenoloxidase enzyme banding patterns and DNA sequences within A. pyxidatus include those by Dodd (1972), Wu & al. (1996), and Lickey & al. (2002). Although there is some variability in morphology and enzyme banding patterns, these studies have shown that wide-ranging populations remain inter-compatible and exhibit little ITS nrDNA sequence divergence.
 
Description type:Non-original description 
Description:Artomyces pyxidatus (Pers.: Fr.) Jülich, Biblioth. Mycol. 85: 399. 1981. - Fig. 18; Plate 1G.
Clavaria pyxidata Pers., Neues Mag. Bot. 1: 117. 1794.
Clavaria pyxidata Pers.: Fr., Syst. Mycol. 1, p. 470. 1821.
Clavicorona pyxidata (Pers.: Fr.) Doty, Lloydia 10: 43. 1947. = Clavaria petersii Berk. & M.A. Curtis, Grevillea 2: 7. 1873.
Holotype: USA. Alabama: no date, coll. Peters, s.n. (ANSPHILA!). = Clavaria coronata Schwein., T. Am. Philos. Soc. 4: 182. 1831.
Holotype: USA. PENNSYLVANIA: Northampton Co., Bethlehem, coll. Schweinitz (?), Syn.# 1041 (ANSPHILA!).
Basidiomata gregarious to scattered, to 100 mm tall x 40 mm wide, petite to slightly robust; branching variable, profusely branched and compact to loosely branched and open. Branches forming to 10 ranks, 5-6 per node, to 2 mm diam; almost white, "light buff" (3A2), "pale ochraceous buff" (4A2), to "lemon yellow" (2A7). Stipe often present, to 25 mm tall x 2 mm diam; basal mycelial pad pure white to rust colored. Tips cuspidate, coronate-cristate, to rarely acicular. Taste and odor mildly to strongly peppery. Dried basidiomata "pale cinnamon pink" (5A2), "cinnamon buff" (6B4), "buff brown" (6D4), "sayal brown" (6C5), "chestnut brown" (7E4), to "cinnamon rufous" (6D7). Context composed of 1) generative hyphae, thin-walled, often inflated, clamped; 2) gloeoplerous hyphae, common, to 8 µm diam, aseptate. GIoeocystidia (Fig. 18a) occasional to abundant, cylindrical to clavate, 2.4-10.0 µm diam, non-emergent to protruding to 12 µm, sometimes inflated to 10 µm in subhymenium narrowing to 6 µm in hymenium. Basidia (Fig. 18b) (16.0-)18.0-28.0(-30.0) µm long (Lm = 21.3 µm ± 3.0) x (3.6-)4.0-4.8 (-5.2) µm diam (Wm = 4.2 µm ± 0.3), clamped. Basidiospores (Plate 1G; Fig. 18c) elongate (Em = 1.65 ± 0.05), 3.6-4.8(5.0) µm (Lm = 4.1 µm ± 0.3) x (2.0-)2.4-2.8(-3.0) µm, amyloid, minutely asperulous, often guttulate.
Distribution and habitat. - Artomyces pyxidatus is widely distributed across much of the North Temperate Zone deciduous forest. It is reported from Canada (Quebec), China (Jilin and Yunnan), Costa Rica, France, Mexico, Russia, Sweden, Switzerland, and United States (eastern states, Arizona, New Mexico, Minnesota, Utah), but is apparently absent from the North American Pacificcoast. Basidiomata are found on rotting hardwood with some unsubstantiated reports of conifer wood.
 
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