the axils of the stipules. Leaves incubous, ovate-oblong to linear oblong, sometimes a little falcate, dorsal margin arched at the base, ventral fairly straight, apex 3-dentate in New Zealand species, decurved or plane, sometimes oblique. Stipules always present, quadrate-ovate, rounded or reniform, apex faintly to deeply 4-lobed, or variously toothed, sometimes margined with 1 to several rows of hyaline rhomboid cells, lateral margins crenate or toothed. Cells usually with thick wills, marginal smaller, a vitta of larger cells present in some species. ♀ branches short, ventral, axillary. Invol. leaves small, in 3 rows, perianth hyaline, tapering, grooved or sub-terete, mouth ciliate. ♂ branches also ventral, axillary perigonial bracts in 3 or 4 pairs, complicate, obtuse or denticulate, each with 2 antheridia. Key to Species of Bazzania 1. Species with a special band of larger cells extending along, and a few cells distant from, the ventral margin of the leaves, stipules free Vittatae 2 Species without a special band of larger cells, stipules connate on one or both sides with the leaves Connatae 4 2. Leaves asymmetrically ovate, convex, apices subentire, stipules divided to the middle into 4 segments B. convexa Leaves ovate-oblong, flat, with apical teeth well developed 3 3. Leaves glaucous green, stipules irregularly divided into 4 obtuse, hyaline segments B. Tayloriana Leaves bright green or brownish, apical teeth diverging, very pronounced, stipules ovate, entire or subentire B. monilinervis 4. Plants small, stems and branches partly bare of leaves, leaves variable in shape, mostly linear-oblong and less than 1 mm. long B. Hochstetteri Plants medium to robust, leaves not fugacious 5 5. Plants robust, leaves large, ca. 3 mm. long, and 1.4 mm. broad at base, apical teeth strong without denticulations, stipules quadrate, taller than broad, crenate B. Novae-Zelandiae Plants medium to robust, leaf apices and upper margins often with denticulations, leaves often auriculate, coalescing in various degrees with the stipules, which are usually broader than tall 6 6. Plants medium, leaves twice the length of basal breadth, apices strongly toothed, stipules also toothed, with few to many rows of hyaline cells B. adnexa Plants mostly robust, leaves involute or lax, apices shortly toothed or subentire, length equalling the breadth of the base, stipules crenate to deeply lobed, toothing slight or absent B. involuta Bazzania convexa (Thunb.) Trevis. Text-fig. 1, fig. 4. Jungermannia convexa Thunberg, Prod. Pl. Cap., 173, 1794. Jungermannia nitida Weber, Prodromus 43, 1815. Mastigobryum convexum G. L. et N., Syn. Hep., 215, 1845; L. et G., Spec. Hep., Fasc. 8–11, 1, 1851; Mitt. Fl. Nov. Zel., ii, 147; Hook. Handb. N.Z. Fl., ii, 524, 1867; Steph., Spec. Hep., iii, 534, 1909. Mastigobryum. heterostipum St. Spec. Hep. iii, 532, 1909. Mastigobryum fissistipum Steph., ibid., 533, 1909. Pleuroschisma convexa Steph., Engl. Bot. Jarhb., 308, 1895. Bazzania convexa Trevis. Mem. 1st. Lomb., 13, 414, 1877; Mitt., Journ. Linn. Soc. 22, 322, 1887; Fulford, Ann. Crypt. et Phytopath. iii, 159, 1946; Sim, Trans. Roy. Soc. Sth. Afr., 15, 81, 1926. Mastigobryum obtusatum Col., Trans. N.Z. Inst., 19, 287, 1886. Mastigobryum fugax Col., ibid., 18, 247, 1885.