Compilation
Pteris usambarensis

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Name

Identification
Pteris usambarensis Hieron. [family PTERIDACEAE ] (stored under name); Verified by Schulan, Pteris usambarensis Hieron. [family PTERIDACEAE ] Verified by Ballard, F., Pteris atrovirens Willd. [family PTERIDACEAE ] Verified by Hieronymus,
Related name
  • Pteris usambarensis
  • Pteris atrovirens

Flora

Entry for PTERIS usambarensis Hieron. [family ]
Herbarium
Royal Botanic Gardens, Kew (K)
Collection
Flora of Tropical East Africa
Resource Type
Reference Sources
Entry From
Flora of Tropical East Africa, page 1, (2002) Author: BERNARD VERDCOURT
Names
PTERIS usambarensis Hieron. [family ], in P.O.A. C: 80 (1895); F.D.-O.A.: 47 (1929); Schelpe in Contrib. Bolus Herb. 1: 63 (1969); Schippers in Fern Gaz. 14: 186 (1993). Type: Tanzania, Lushoto District, E Usambaras, Mbalamu, Holst 2499 (B, holo., K, photo.!, K!, iso.)
PTERIS cretica [family ], [sensu Peter, F.D.-O.A.: 47 (1929), non L.]
Information
Rhizome shortly creeping, erect or ascending, woody, occasionally branched, covered with dark brown long linear scales. Fronds 4–6-tufted, 0.9–1.5 m tall. Stipe yellow-brown to dark brown or ± black, 45–70 cm long, sometimes shiny, curved near to base. Lamina dark green, triangular in outline, up to ± 35–58 cm long and wide, imparipinnate near apex, bipinnate near base; pinnules oblong-lanceolate, 5–27 cm long, 1.5–5 cm wide, with a long terminal lobe 5.5–15 cm long, 5–10 mm wide, narrowly lanceolate, often bilobed at base and 3–16-jugate; oblong lateral ultimate lobes 1–4 cm long, 4–8 mm wide; sterile margins all serrate; lower pinnae with distinct stalks 1–6 cm long giving an open look to the frond; pinnule costae with spinules at junction of costules on upper surface; veins free. Sori extending from well above the sinus for about 3/4 length of the lobe.
Range
DISTR. K 7; T 3, 5?, 6, 7 not known elsewhere (see note)
Altitude range
1050–1950(–2000) m
Distribution
KENYA Teita District Mbololo Hill, Gardner in F.D. 2944! & Taita Hills, Ngangao Forest, 11 Feb. 1977, R.B. & A.J. Faden 77/330! & Kasigau Mt, 1 June 1969, Gillett 18765!TANZANIA Lushoto District Mt. Mlinga, 17 Aug. 1950, Verdcourt 310!;TANZANIA Kilosa District Ukaguru Mts, Mnyera Mt, 1 June 1978, Thulin & Mhoro 2810!;TANZANIA Morogoro District Uluguru Mts, E slopes of Bondwa, 26 Sept. 1970, Faden et al. 70/634!
Notes
Schelpe in Contr. Bolus Herb. 1: 64 (1969) states Pteris kivuensis C.Chr. (in Dansk. Bot. Arkiv 9: 71 (1937); type: Congo (Kinshasa), W. of Lake Kivu, Humbert 7826 (BM!, holo.) may be a variety of P. usambarensis differing in having a greyish green stipe, a lighter green lamina and less caudate pinna apices but Pichi Sermolli (in Webbia 32: 72 (1977) & in B.J.B.B. 53: 227 (1983)) states ‘ P. kivuensis can be confidently treated as a species on its own, sharply distinct amongst the free vein species’ and also records it from Rwanda and Burundi.Schippers in Fern Gaz. 14: 186 (1993) records it from the Nguru Mts citing Pócs et al. 88182/M.

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