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Page number:609 
Remarks (public):Very close to H. alutaria from which it differs only in the clearly odontioid hymenophore. It is possible that the corticioid forms reported by Bourdot & Galzin (1928 p. 427) belong rather to H. alutaria. In N. Europe H. arguta seems to show little variation and is easily recognized.
The original description in Fries (loc. cit.) does not give sufficient information for a decision on what fungus he had in mind. Many other hydnoid resupinates could just as well match this description. There is no authentic material left, why we had to rely upon the existing tradition. This is, however, rather unanimous (Bourdot, Bresadola, Lundell, Litschauer a.o.) thus there should be no problem, though there are elements in Fries's description that could seem to contradict, esp. the word "candidus" for the colour of the fruit-bodies. Very young fruitbodies may be creamish white but it is never pure white or snow-white. We hesitate to choose a neotype until the matter is better investigated.
Description type:Non-original description 
Description:Hyphodontia arguta (Fr.) John Erikss., Symb. bot. Ups. 16:1 p. 104, 1958. -Hydnum argutum Fr., Syst. mycol. I p. 424, 1821.
Fruitbody resupinate, effuse, adnate, whitish, creamish or argillaceous when young, when mature pale ochraceous, postmature dull ochraceous; hymenium odontioid with normally conical to cylindrical aculei, 0,5-2 mm long, obtuse or tapering to the apex which is tomentose or even penicillate (under the lens) by the projecting hyphae and cystidia, but aculei may vary in shape, in well developed specimens very regular but especially in older ones irregular formed with several tips, on sloping substrate sometimes flattened; margin in young states indeterminately thinning out into a pruinose periphery but in mature states more abrupt; subiculum thin, subicular hymenium between the aculei porose-reticulate, well developed in young fruitbodies but more or less disappearing with age.
Hyphal system monomitic; hyphae ab. 2-3 µm in diam., distinct, somewhat thickwalled, fibulate, sparsely branched and rather straight in the centre of the aculei, in other parts richly branched and irregularly intertwined, denser and thinner in the subhymenial texture; young hyphae hyaline, mature ones yellowish; all hyphae cyanophilous.
Cystidial organs of two kinds, 1) capitate, somewhat projecting, little differentiated from sterile hyphal ends, beside the apical head also often intercalary enlargements, the head in the living fruitbody surrounded by a resinous drop (lens 50 x), drying up to a brittle, cap-like encrustation, length to the first septum 40-75 µm, head 5-7 µm wide, with encrustation 7-10 µm, 2) lagenocystidia, apical encrustation ab. 8-10 µm long, whole length to the first septum 30-50 µm. Both types of cystidial organs agree with those of H. alutaria.
Basidia at first clavate, then subcylindrical with median suburniform constriction, often sinuous, 15-18 x 3,5-5 µm, with 4 sterigmata and basal clamp.
Spores broadly ellipsoid, thinwalled, smooth, 1-2-guttulate, non-amyloid, slightly cyanophilous, 4,5-6 x 3,5-4 µm.
Habitat. On much decayed wood, preferably of deciduous trees.
In Scandinavia the biotopes are usually different kinds of humid and fertile deciduous forests or conifer forests with scattered deciduous trees.
Distribution. In Sweden it is not very frequent and occurs only in the southern part, northwards to Uppland. It seems to be more common in the eastern provinces than in the western. There are numerous collections from Uppland and especially from the surroundings of Stockholm, while Hjortstam found it only once in Vastergötland. Strid does not report it from NC. Sweden. It is known from Denmark, SE. Norway and SW. Finland. Outside Scandinavia it is widely distributed and relatively common, e.g. in C. Europe and in N. America.
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