Drynaria volkensii Hieron.

rkfelsh 2025. 3. 2. 09:43

국표에 없다.

Found in

Africa East Tropical Africa Kenya,Tanzania.Uganda,Northeast Tropical Africa Ethiopia,Somalia,Sudan,South Tropical Africa Malawi
Mozambique,Zambia,West-Central Tropical Africa Burundi,Cameroon,Gulf of Guinea Is.Rwanda,Zaire

Drynaria volkensii Hieron. (worldfloraonline.org)

Information

Rhizome up to 1 cm (1.5 cm in life) in diameter, creeping, often encircling the boles of large trees, with spaced fronds and with dark brown rhizome-scales up to 6 mm long, broadened and peltate at base, strongly tapering, shortly spinulose at margins throughout. Sterile fronds up to 24(–30) cm long, up to 18 cm wide, sessile, erect, ovate in outline, chartaceous, with prominent veins, pinnatifid into narrowly oblong acute to obtuse lobes, glabrous except for minute brown laciniate scales along the midrib. Fertile fronds 0.3–1 m long, erect to arching, firmly herbaceous, stipitate; stipe pale brown, up to 37 cm long, 0.3–0.4 cm in diameter, glabrous; lamina up to 73 cm long and 44 cm wide, ovate-oblong in outline, with a narrow wing decurrent on to the stipe, pinnatifid almost to the midrib into linear-oblong acute-acuminate lobes up to 23 cm long, up to 4.5 cm wide with abruptly broadened adnate bases, margin minutely and irregularly notched, thinly set with brown laciniate scales when young, glabrous at maturity. Sori orange, 2–2.5 mm in diameter, round, borne close to the costa, about 3 mm apart. Fig. 3/1–3 (p. 12) & 4 (p. 13).

Range

DISTR. U 1, 2, 3, 4; K 3–5; T 2, 4, 6, 7 widespread in tropical Africa from Cameroon, Bioko, Congo (Kinshasa), Rwanda, Burundi, Sudan (Imatongs), Ethiopia, Somalia (fide Tardieu-Blot), Zambia, Malawi and Mozambique

Altitude range

1200–2700 m

Distribution

UGANDA Toro District Lake Mutanda, Mushongero, Dec. 1938, Chandler & Hancock 2529!KENYA Trans-Nzoia District Cherangani Hills, Kapolet, Nevile’s Farm, May 1964, Tweedie 2799!TANZANIA Arusha District Arusha National Park, Mt Meru, Jakukumia, 10 Mar. 1971, Richards 26716!UGANDA Mbale District Elgon, Bulago, 29 July 1917, Snowden 518! & Bugisu [Bugishu], Buginyanya, 29 Aug. 1932, A.S. Thomas 366!KENYA Kiambu District Limuru, Feb. 1915, Dummer 1716!KENYA Kericho District Sotik, Chepalungu Forest, Feb. 1931, Gardner in F.D. 2536!TANZANIA Ufipa District Pito, 2 Nov. 1949, Bullock 1938!TANZANIA Kilosa District Ukaguru Mts, Mamiwa Forest Reserve, ridge to N Mandego Forest Station, 2 Aug. 1972, Mabberley 1344!TANZANIA Iringa District Mufindi, Luisenga R., 16 Mar. 1962, Polhill & Paulo 1778!

Notes

Roos dates D. volkensii from 1908 but in my view there is no description and

Hieronymus says “can be separated off as D. volkensii if one places importanceon...”

Drynaria volkensii in Global Plants on JSTOR