Calyptrochaeta grandiretis H. Robinson 1975

Calyptrochaeta grandiretis

Calyptrochaeta grandiretis (Broth.) H. Robinson, new comb.

Eriopus grandiretis Broth. in Skottsb., Nat. Hist. Juan Fernandez 2:436, 1924. [Original material: Quebrada de las Casas, Mas Afuera, coll. C. & I. Skottsberg n. 265.]

Whitish green plants, with sparingly branched stems 2–6 cm long, prostrate to ascending in rather loose mats, leafy stems to 9 mm broad. Dorsal and ventral leaves very broadly ovate, to 2.5 mm wide and 3.5 mm long, slightly asymmetric; lateral leaves broadly oblong-elliptical, to 3.0 mm wide and 4.5 mm long, bases of laminae very unequal with costa inserted to one side, leaves rounded at base, minutely apiculate at apex; costa often reaching to mid-leaf; margins plane, sharply serrate in upper half with teeth split by a longitudinal septa, a single row of marginal cells 10–20 μm wide; submarginal cells sometimes elongate; inner cells 80–150 μm long, 50–60 μm wide, rhomboidal, thin-walled; cells nearer margins shorter, rhomboidal to hexagonal, 40 μm wide, 40–60 μm long. Dioicous. Sporophyte unknown.

MAS AFUERA: Q. Casas, H. & E. 240.

MAS A TIERRA: Pangal Falls, H. & E. 5, 191; E slope below Portezuelo de Villagra, 1400–1800 ft, H. & E. 181.

As presently known the species is endemic to Juan Fernandez.