A conspectus of the native and naturalized species of Nephrolepis (Nephrolepidaceae) in the world
Hovenkamp PH
Miyamoto F
Blumea
2005
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BBLNZ
(F. Ballard) Hovenkamp & Miyam
Hovenkamp & Miyam
F. Ballard
Polypodiopsida
Nephrolepidaceae
Nephrolepis
Plantae
Polypodiales
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297
Tracheophyta
variety
pumicicola
pumicicola
Differs from the typevariety: Rhizome thin, upright, up to 10 cmhigh, fronds stiffly erect, narrow, to 120 by 3-3.5 cm;pinnae perpendicular to rachis.
Distribution - Africa: Sao Tome, Cameroon.
Habitat & Ecology - At low elevations to 1500 m,terrestrial, often in crevices of young volcanic rocks.
Note - This variety is restricted to the Gulf of Guinea. It is relatively easy to recognize when compared with the in Africa widespread species N. undulataby its perennial habit, the stem-forming rhizome (but this may not be evident in all specimens) bearing rigidly erect fronds with numerous, small pinnae at right angles to the plane of the rachis. None of these characters provide a clear basis for a distinction as a separate species, as all occur to varying degrees in N. cordifoliafrom other regions. Moreover, some specimens also collected on lava show a more relaxed habit, with less distinctly horizontal pinnae and a less stiffly erect habit, and thus are closer to typical N. cordifolia(e.g., Benl& Benl FP54, Fernando Po; Mildbraed10678).For these reasons, we include this as a variety in N. cordifolia . However, a number of collections from the VirungaMountains( Congo) include plants forming small tufts ( Burtt3280, K,"frequent inside crater") as well as plants with the typical rhizome of N. undulata( Burtt3117, K,"lava plains"). Clearly, more detailed investigations are necessary to decide whether N. pumicicolais here rightly included in N. cordifolia, or whether it should be included, as a perennial variety, in N. undulata .
923900991
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K
Keay 28655
Thailand
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297
Type
923900994
2005-01-01
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Benl & Benl FP 54
Guinea
Fernando Po;
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297
Fernando Po;
923900975
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Mildbraed 10678
Guinea
18
297
Fernando Po
923901006
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K
Burtt 3280
Guinea
18
297
Fernando Po
923900999
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K
Burtt 3117
Guinea
18
297
Fernando Po