Didymodon icmadophilus

Ignatova, E. A., Fedosov, V. E., Kuznetsova, O. I., Fedorova, A. V. & Ignatov, M. S., 2024, On the genus Didymodon s. str. (Pottiaceae, Bryophyta) in Russia, Arctoa 33 (2), pp. 129-155 : 134

Didymodon icmadophilus

We selected a number of samples from Asian Russia that were identified as D. icmadophilus according to keys and descriptions in Russian handbooks. None of these Asian specimens were resolved together with GenBank accessions of this species. Instead, some appeared in D. validus -clade, while others formed a clade next to one specimen of D. daqingii (the species which possesses leaves with very longly excurrent costae, but have bistratose leaf margins) and in a clade sister to D. hengduanensis . One specimen from Irkutsk Province with leaves similar in shape to D. icmadophilus and weakly papillose laminal cells was resolwed in a clade with Chinese specimens of D. hengduanensis . However, one sample from the Caucasus collected in a moist habitat at the riv- er bank and matching well D. icmadophilus in morphology was found within a fully supported D. icmadophilus - clade, thus confirming its presence in the Russian Caucasus. Thus, herbarium collections from Russia named as D. icmadophilus should be revisited to clarify its real distribution, taking into account its accurate description, e.g., by Jiménez (2006), and its ecological preferences.