Cololejeunea sublatistyla J.Wang & R.L.Zhu, 2014

Cololejeunea sublatistyla J.Wang & R.L.Zhu , sp. nov. ( Fig. 1 View FIGURE 1 )

Diagnosis. A new species characterized by the autoicous plants; the presence of large, hyaline cells at the apical and dorsal margin of leaf lobe; the rectangular-ovate, triangular or triangular-ovate leaf lobules with two teeth at apex; the large stylus (9–14 cells long and 2–3 cells wide); the female bract lobule with an entire margin.

Type: — CHINA. Hainan. Ledong Co., Jianfengling National Nature Reserve , epiphyllous, 812 m, 19 Jul. 2009, Ling-Yan Zhou 0323085 (holotype: HSNU!) .

Etymology. The epithet refers to the close similarity to Cololejeunea latistyla .

Description: —Autoicous. Plants 6–16 mm long, 1.2–1.5 mm wide, pale yellowish in herbarium, irregularly branched, branches of the Lejeunea - type. Stems 60–90 µm in diameter, ventral merophyte 2 cells wide, stem in transverse section with 6–7 cortical cells and 1 medullary cell. Rhizoids numerous, fasciculate, hyaline, rhizoid disc absent. Leaves imbricate. Lobe ovate to subelliptical, 0.66–0.80 mm long, 0.54–0.66 mm wide, apex rounded, margin entire, apical and dorsal margin usually bordered by 1–3(–4) rows of hyaline cells. Lobe cells thin-walled, trigones very small, intermediate thickenings absent, marginal hyaline cells subquadrate to rectangular, 20–36× 6– 14 µm, median cells hexagonal, 22–40× 14–30 µm, basal cells elongate-hexagonal, 30–50× 14–28 µm. Cuticle usually finely punctate. Oil bodies not seen. Ocelli and vitta absent. Lobule mostly rectangular-ovate, rarely triangular or triangular-ovate, smooth on ventral surface, 1/4–2/5 as long as the lobe, free lateral margin plane, with 2 teeth at apex, first tooth large, 3–5 cells long and 2-5 cells wide at base, second tooth small, 1–3 cells long and 2- 3 cells wide at base, hyaline papilla spherical or oblong, marginal. Stylus large, 9–14 cells long, 2–3 cells wide. Androecia usually on short lateral branches, 0.70–0.90 mm long, 0.34–0.50 mm wide; male bracts in 5–8 pairs; bract lobes ovate or oblong, 0.24–0.40 mm long, 0.12–0.24 mm wide; bract lobule 2/3–3/4 as long as the bract lobe. Gynoecia on short or long branches, with an athecal innovation; bracts similar to leaves in size and shape, bract lobules ligulate, triangular ligulate, ca. 1/2 as long as the bract lobe, margin entire. Perianth obovate, 0.60– 0.90 mm long, 0.42–0.56 mm wide, with 3 smooth keels (one ventral keel and two lateral keels), beak 1 cell long. Only immature sporophytes seen. Gemmae not seen.

Ecology and distribution. Cololejeunea sublatistyla occurs on living leaves with Leptolejeunea elliptica (Lehm. & Lindenb. in Lehmann 1833: 13) Shiffner (1893: 126). The new species is thus far known only from the type locality in Hainan Province, China.