Arcyria monticola from Hokkaido, northern Japan: its habit, detailed morphology, and comparison with Arcyria imperialis

Arcyria monticola was found in Hokkaido, northern Japan. This is the first record of its locality, except for the type locality. The linearly expanding capillitium with many coils characterizing A. monticola consists of very elastic longitudinal tubes, short lateral tubes, and many small intricate nets. A longitudinal tube coils around a small intricate net, which forms a core. In contrast, A. imperialis, the other known Arcyria species with a linearly expanding capillitium, has neither short lateral tubes nor nets. The microscopic character of the A. imperialis capillitium is also totally different from that of A. monticola.