Compilation
Pteris preussii

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Name

Identification
Isotype of Pteris preussii Hieron. [family PTERIDACEAE ] (stored under name); Verified by Arthur Hugh Garfit Alston, Pteris quadriaurita Retz. [family PTERIDACEAE ]
Related name
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  • Pteris quadriaurita
  • Pteris preussii

Flora

Entry for PTERIS preussii 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 preussii Hieron. [family ], in E.J. 53: 399 (1915); Alston, Ferns W.T.A.: 40 (1959); Tardieu, Fl. Cameroun 3: 160, t. 22/1–2 (1964); Schelpe, Contrib. Bolus Herb. 1: 64 (1969); Schippers in Fern Gaz. 14: 186 (1993); Faden in U.K.W.F. ed. 2: 20 (1994). Type: Cameroon, Buea, Preuss 585 (B!, holo., BM, P, iso.)
PTERIS prolifera Hieron. [family ], in E.J. 53: 397 (1915); Tardieu, Mém. I.F.A.N. 28: 72, t. 11, fig. 1–2 (1953); Alston, Ferns W.T.A.: 40 (1959); Tardieu, Fl. Cameroun 3: 158 (1964); Schelpe, Contrib. Bolus Herb. 1: 64 (1969). Type: Cameroon, Lolodorf, Staudt 197 (B, holo., P. iso.)
PTERIS diestelii Hieron. [family ], in E.J. 53: 400 (1915). Type: Cameroon, Buea, Diestel 456 (B!, syn., BM, photo., P, iso.)
Information
Rhizome woody, erect or shortly creeping with dark linear-lanceolate scales 5 mm long, with narrow paler erose margins. Fronds tufted, (0.5–)1–2 m tall. Stipe straw-coloured, darker at base, 50–85 cm tall. Lamina ovate-lanceolate in outline, pinnate, 0.6(–1) m long, up to ± 50 cm wide, with apical gemma, near top pair of pinnae; pinnae in 11–18 pairs, narrowly oblong in outline, the lower bifid, 7.5–35 cm long, 2–6 cm wide, with 12–46 pairs of narrowly oblong ultimate segments 2.3–5 cm long, 2–5 mm wide, obtuse; terminal segments 6 cm long, 4 mm wide; sinuses usually wide; pinna segments sometimes replaced by a pinnatifid pinnule; costal spinules present above at junctions with costulae and often along costulae as well; veins free. Sori extending for ± 1/2–4/5 the length of segments, the sterile margins beyond entire.
Range
DISTR. U 2, 4; K ? 2, 5; T ? 2, 6, 7
Altitude range
(500–)900–2700 m
Distribution
KENYA N Kavirondo District Kakamega Forest, along R Yala, about 4.8 km SE of Forest Station, 25 Nov. 1969, Faden et al. 69/2010! & NE of Forest Station, 24 Nov. 1969, Faden et al. 69/1978!;KENYA Kericho District 5 km NW of Kericho, Kimugung R, 10 June 1972, Faden et al. 72/293!TANZANIA Morogoro District Uluguru Mts, along road from Morningside to the summit of Bondwa, 3 Apr. 1974, R.B. & A.J. Faden 74/387! & same locality, 3 July 1970, Faden et al. 70/319!;TANZANIA Iringa District Mwanihana Forest Reserve, above Sanje Village, 10 Oct. 1984, D.W. Thomas 3888!UGANDA Bunyoro District Budongo Forest, track from Busingiro, 16 Sept. 1969, Faden et al. 69/1074!;UGANDA Toro District Bwamba Forest, Kabango, 21 Nov. 1935, A.S. Thomas 1501A!;UGANDA Mengo District Mulange, July 1919, Dummer 4174!
Distribution (external)
; Cameroon
Bioko
Congo (Kinshasa)
Sudan (fide Schelpe)
? Angola (see note)
Notes
I am not convinced that the mere presence or absence of gemmae is a good specific character; this taxon may be no more than a variety of P. catoptera. Faden says when growing with the latter P. preussii has more pinnae. The ultimate segments are often longer and the sinuses broader but this is not constant. Tardieu distinguishes P. prolifera on the depth of division of the segments but this is very variable. Alston and Schelpe (1969) record P. prolifera from Angola but Schelpe does not mention it in his C.F.A. account. A number of sheets from the Kilimanjaro, Mt Meru area ofT2 without gemmae have been annotated P. preussii by Schelpe but he gives no hint as to how he knew.

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