Thelypteris arbuscula (Willd.) K.Iwats.

Thelypteridaceae, Bernard Verdcourt. Flora of Tropical East Africa. 2006

Type

Type: Mauritius, Bory de St. Vincent in Herb. Willd. 19763 (B-W, holo., seen by Holttum)

Rhizomes

Rhizome erect to 30 cm or more tall with thick layer of roots and dark brown lanceolate distinctly hairy scales 3–4 mm long

Leaves

Fronds tufted 0.5–1.5 m tall

Stipes

Stipe 5–10 cm long, densely shortly adpressed hairy

Leaf lamina

Lamina narrowly oblong, 35–70 cm long, 12–28 cm wide, bipinnatifid, with 5–10 pairs of lower pinnae gradually reduced, all auricled at acroscopic base or not; largest pinnae linear-lanceolate, 6–17 cm long, 7–16 mm wide, acuminate to a rather blunt apex, distinctly auricled at base, usually distinctly crenate-serrate for 1–1.5 mm but sometimes only slightly so, lower surface densely hairy and with spherical glands also some glands on upper surface; lobes shortly obliquely ovate, up to 3 mm long and wide; veins 4–6 pairs, 11/2 pairs anastomosing next to the short sinus-membrane

Sori

Sori forming 3–4 lines on each side ± parallel to pinna costa; indusium with short hairs and glands; sporangia with yellow glands

Figures

Fig 12, p 39