A key to 13 accepted species of Hyphodontia
1a. Hymenophore smooth to grandinioid.......................................................................................................................................	2
b. Hymenophore odontioid or poroid..............................................................................................................................................	7
2a. Lagenocystidia abundant............................................................................................................................................................	3
b. Lagenocystidia rare or absent.......................................................................................................................................................	5
3a. Capitate septocystidia absent; basidiospores thick-walled, more than 4 μm wide.........................................	H. pachyspora
b. Capitate septocystidia present; basidiospores thin-walled, less than 4 μm wide...................................................................	4
4a. Hymenophore colliculose............................................................................................................................................	H. alutaria
b. Hymenophore grandinioid........................................................................................................................................	H. zhixiangii
5a. Basidiospores less than 5 μm long, less than 3 µm wide.........................................................................................	H. pallidula
b. Basidiospores more than 5 μm long, more than 4 µm wide......................................................................................................	6
6a. Lagenocystidia generally rare...............................................................................................................................	H. subdetritica
b. Lagenocystidia absent.............................................................................................................................................	H. subpallidula
7a. Hymenophore poroid................................................................................................................................................	H. borbonica
b. Hymenophore odontioid...............................................................................................................................................................	8
8a. Hymenophore brownish orange, cinnamon-buff, tawny olive or buckthorn brown.......................................	H. ochroflava
b. Hymenophore whitish to yellowish, cream or orange...............................................................................................................	9
9a. Basidiospores globose, slightly thick-walled.....................................................................................................	H. sphaerospora
b. Basidiospores ellipsoid, cylindrical or ovoid, thin-walled......................................................................................................	10
10a. Capitate cystidia absent...........................................................................................................................................................	11
b. Capitate cystidia present..............................................................................................................................................................	12
11a. Basidiospores ellipsoid to cylindrical, more than 4.5 µm long, less than 3 µm wide..........................................	H. wrightii
b. Basidiospores broadly ellipsoid to ovoid, less than 4.5 µm long, more than 3 µm wide.......................................	H. wongiae
12a. Basidiospores more than 3 μm wide; aculei up to 2 mm long..................................................................................	H. arguta
b. Basidiospores less than 3 μm wide; aculei up to 6 mm long.....................................................................................	H. dhingrae