Entry From
Flora of North America, Vol 27,
Discussion
The yellow seta, mostly plane margins, and large tubers, when present, buried in the soil, and the operculum commonly as long as the theca readily distinguish Barbula convoluta from the similar B. unguiculata. Bryoerythrophyllum ferruginascens also has tubers, but the lamina is red in KOH solution. The small antheridiate plants that appear as buds on the soil indicate the possibility of rhizautoicy, as noted by A. Casares-Gil and A. Caballero (1919–1932, vol. 2), but, because they are usually grouped, they may have been generated on protonema of a separate spore. This is one of the few species of the family to fruit in the Arctic. When sterile, Barbula convoluta may be quickly distinguished from the hygrophile Gymnostomum aeruginosum by its leaves very deeply keeled distal to mid leaf, and leaf tips more commonly reflexed and more broadly acute or rounded. Barbula convoluta differs from B. indica by its simple papillae on the abaxial surface of the costa and the commonly papillose clear cell of the apiculus, when present. Syntrichia amplexa is occasionally mistaken for B. convoluta but is immediately identified by its recurved leaf margins and red color in KOH. Although var. eustegia is clearly a western taxon, attempting to ascribe North American sterile collections to either var. eustegia or the typical variety (or fertile collections to any European variety with consistency in character combination) is presently futile (R. H. Zander 1997).
