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Page number:225 
Remarks (internal):Due to its treatment with a hazardous chemical, the type specimen (L) is unavailable for study, so a direct comparison cannot be made. However, Corner's (1970) description of the Clavicorona dichotoma basidiomata ("grey when fresh, drying dark fuscous with a greyish hymenium") compares very well with SF 7220, which was collected less than 75 km from the type locality in Java. He emphasized a dichotomous branching habit which occurs at several nodes on SF 7220. Micromorphological characters of SF 7220 are also very similar to Corner's (1970) description of the type, including the presence of thick-walled hyphae. Basidiospore measurements from Corner (4 4.5 x 3 3.5 µm) are only slightly larger than those reported here (3.2 4.2 x 2.6 3.2 µm) for SF 7220, and based on his measurements, "E" is approximately 1.3, compared to 1.27 for SF 7220. Without indicating that he studied the type material, Dodd (1972) reported spore lengths (4.5 5.0 µm) slightly larger than was given in Corner (1970). Dodd (1972) also reported basidia measurements of 16 18 x 4 4.8 µm, where Corner (1970) did not report any.
Basidiomata of Artomyces colensoi also exhibit thick-walled hyphae in the context, but the species can be distinguished from A. dichotomus because of its ellipsoid spores (Em = 1.48), whereas A. dichotomus has broadly ellipsoid spores (En, = 1.27). Basidiomata of A. colensoi also are typically more petite than those of A. dichotomus.
The phylogenetic estimation indicates that SF 7220 (isolate DED 7220) is included on a unique branch in the "piperatus" group
Description type:Non-original description 
Description:Artomyces dichotomus (Corner) Jülich, Biblioth. Mycol. 85: 399. 1981. - Fig. 14.
Clavicorona dichotoma Corner, Nova Hedwigia 33: 146. 1970.
Holotype: INDONESIA. JAVA: Mt. Pangarango, 29 Mar 1950, coll. S. J. van Oostroom, No. 13385 (L., n.v.).
Basidiomata to 50 mm tall x 12 mm wide, loosely branched, stoutish, tough, pliant and leathery. Branches forming to 5 ranks, branches 2-4 per node, to a little more than 1 mm diam, (5E3, gray-brown) to "blackish brown" (6F3). Three primary stems 10 mm long x 1-2 mm diam; basal mycelial pad brown. Tips rounded to truncate-cuspidate to rarely coronate, with a crown of three to four short, acicular points. No odor reported, taste mildly acrid. Dried basidioma "blackish brown" (6F3) to "carob brown" (7F5-7), with a grayish-white coating. Context dense, brown, composed of 1) generative hyphae, thin-walled, not inflated, clamped; 2) thick-walled hyphae, walls to 1.2 µm thick, rarely branched, aseptate; 3) gloeoplerous hyphae, common, to 8 µm diam, aseptate. Gloeocystidia (Fig. 14a) uncommon, extremely dilated to 16 µm diam in subhymenium, quickly narrowing to approximately 3 µm diam in hymenium. Basidia not measured. Basidiospores (Fig. 14b) broadly ellipsoid (Em, = 1.27 ± 0.06), 3.2-4.2 µm (Lm = 3.6 µm ± 0.3) x 2.6-3.2 µm, amyloid, minutely asperulate, guttulate.
Distribution and habitat. - The only two known specimens of A. dichotomus were collected in Java, less than 75 km from
each other, somewhat south of Jakarta. No substratum was included with SF 7220, but field notes state it was found "on buried rotten 1og in primary forest."
Specimen examined. - INDONESIA. JAVA: Mt. Halimun National Park, 10 Jan 2001, coll. A. Wilson and D. E. Desjardin, DED 7220 (SF 7220).
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