Heterocladium leucotrichum Mitten, Trans. Linn. Soc. London, Bot. 3: 176. 1891

Plants tightly attached to substrate. Stems stoloniferous. Stem leaves slightly reflexed when moist, 0.5-1 × 0.3-0.4 mm. Seta 0.4-0.7 cm. Capsule exserted, dark brown, 0.7-1 mm; exostome teeth smooth proximally, papillose distally; endostome rudimentary. Spores 12-30 µm.

Trees, rock; low to moderate elevations; B.C.; Alaska, Oreg., Wash.; e Europe; e Asia (China, Japan, North Korea, Russian Far East).

In Oregon and Washington, Iwatsukiella leucotricha occurs on trees along fog-drenched coastal ridges. Collections from British Columbia were made from trees in coastal bogs and swamps; this species has also been collected on rock in Alaska.