Synoptic Revision of Diplazium (Athyriaceae) in Rwanda with description of Diplazium cyamudongoense sp. nov.
Author
Fischer, Eberhard
0000-0001-7455-9833
Institute for Integrated Natural Sciences-Biology, University of Koblenz, Universitätsstrasse 1, 56070 Koblenz, Germany. efischer @ uni-koblenz. de; https: // orcid. org / 0000 - 0001 - 7455 - 9833
efischer@uni-koblenz.de
Author
Lobin, Wolfram
Botanical Gardens Bonn University, Meckenheimer Allee 171, D- 51115 Bonn, Germany.
text
Phytotaxa
2023
2023-06-26
600
3
169
183
http://dx.doi.org/10.11646/phytotaxa.600.3.4
journal article
54702
10.11646/phytotaxa.600.3.4
2a1cbd1e-993f-4c7c-b5ed-abe41c0fe91e
1179-3163
8080860
Diplazium humbertii
(C.Chr.)
Pichi Sermolli (1973: 444)
(
Figs. 4 E–F
,
6–7
).
Athyrium humbertii
Christensen (1937: 54)
Lectotype
(designated by
Pichi Sermolli 1973
):— D.R.
CONGO
.
North Kivu
:
Montagnes
à
l’Ouest du
Lac Kivu
(Congo Belge). Forêt,
2000–2400 m
,
February–March 1929
,
H. Humbert
7497
(
BM000918405!
;
isolectotype
BM000918404!
)
Specimens seen:
—
RWANDA
. Western Province: Nyungwe National Park, route Astrida (= Huye) – Bukavu, vers km 93, forêt de Rugege (= Nyungwe) près d’Uwinka, Territ. Shangugu (= Rusizi),
24 September 1956
,
G. Troupin 2598
(BR0000013688578); a sud-est del lago Kivu a
45 km
da Bukavu lungo la strada per Astrida (= Huye),
15 August 1956
,
R. Pichi Sermolli 5323
(BR0000013688585); Forêt de Nyungwe, environs de Kamiranzovu, Préfecture Cyangugu (= Rusizi),
September 1971
,
G. Bouxin 1211
(BR0000013688462); Kamiranzovu,
11 August 2007
,
E. Fischer s.n.
(KOBL); Cyamudongo Forest,
4 April 2021
,
E. Fischer s.n.
(KOBL).
Distribution in
Rwanda
:
—Western Province, Nyungwe National Park.
Distribution in Africa:
Eastern D.R.
Congo
, Western
Uganda
, Western
Rwanda
, Western
Burundi
, Western
Tanzania
. Albertine Rift endemic.
Habitat:
—Montane rainforest, elev.
1900–2400 m
.
Note:
—The spores (
Fig. 4 E, F
) resemble those of
Diplazium cyamudongoense
sp. nov.
(Fig, 4 A–D) and have a cristate perispore, 54.3–57.2 × 28.6–37.1 µm, the alae are 5.7–7.15 µm high and 1.5–2.86 µm wide. The remaining perispore bears up to 1.4–1.6 µm long spine-like scattered projections.