Disentangling the diversity and taxonomy of Hymenophyllaceae (Hymenophyllales, Polypodiidae) in the Comoros
Author
Ahamada H. Saïd
Author
Sabine Hennequin
Author
Germinal Rouhan
Author
Jean-Yves Dubuisson
text
European Journal of Taxonomy
2017
2017-04-28
313
1
53
journal article
32053
10.5852/ejt.2017.313
e9b8382f-faec-4925-993b-f13e4cfa2a71
2118-9773
896401
Hymenophyllum sibthorpioides
(Bory ex Willd.) Mett. ex Kuhn
Hymenophyllum sibthorpioides
(Bory ex Willd.) Mett. ex Kuhn,
Filices Africanae
: 41 (1868). –
Trichomanes sibthorpioides
Bory ex Willd.
,
Species plantarum
: 498 (1810). – Type: ‘Habitat in insula Borboniae’,
J.B.G.M. Bory de St.Vincent s.n.
(holo-: BW20204010!; iso-: P00612300!).
Trichomanes parvulum
Poir.,
Encyclopédie
méthodique
,
Botanique
8: 64 (1808), non
Copel. (1933: 145)
, nec auct. – Type: ‘L’île de Madagascar’,
L.M.A. du PetitThouars s.n
. (holo-: P00065014!; iso-: P00065015!).
Microtrichomanes parvulum
(Poir.) Copel.,
The Philippine
Journal of Science
67: 37 (1938).
Trichomanes flabellatum
Bory ex Desv.,
Mémoires de la Société
linnéenne de Paris
6 (2): 325 (1827), nom. nud. – Type: Cites
Trichomanes flabellula
d’Urv.,
Mémoires de la Société
linnéenne de Paris
4: 597 (1824).
Trichomanes thouarsianum
C.Presl,
Eine
botanische Abhandlung
: 40 (1843). – Type: ‘Habitat in insula Borbonia’,
L.M.A. du PetitThouars s.n
. (not located).
Hymenophyllum palmatum
Bosch,
Nederlandsch Kruidkundig Archief
4: 385 (1858). – Type: ‘L’île Bourbon’, s.d.,
s. coll. s.n
. (iso-: K000435612!).
Short description
Epiphytic; long-creeping filiform rhizomes, bearing sparsely distributed roots and long reddish brown trichomes, and widely separated fronds; fronds with wingless stipes, up to 4 cm long, slightly curled in the wild, flabellate to reniform, palmatisect with dichotomous venation; few sori, paratactic, bilabiate without a developed base and with toothed margins.
Global distribution
Western Indian Ocean, East and South Africa.
Distribution in Comoros
Anjouan, Grande Comore, Mohéli.
Additional specimens examined
COMOROS: ANJOUAN, s. loc., 1905?,
M.Lavanchie s.n.
(P01430258, P00139617); Au camp de base du Mont N’Tringi, en montant vers la crête nord, 14 Nov. 2009,
G.Viscardi et al. 166
(P02439808). GRANDE COMORE, Massif du Karthala, 2 Dec. 2002,
F.Rakotondrainibe et al. 6872
(P00312335). MOHÉLI, Piste entre Miringoni et le Chalet St Antoine, 4 Nov. 2008,
G.Rouhan et al. 888
(P02439806); Au-dessus de Drondroni, 27 Mar. 2011,
E.Bidault et al. 65
(P02439771).
Note
The type of the species (
J.B.G.M. Bory de St.Vincent s.n.
; BW20204010) is cited from Bourbon (‘
Habitat in insula Borboniae
’; Bourbon is a former name for La Réunion) in the original description by
Willdenow (1810)
while the type specimen present at P would have been collected in ‘
Ile de France
’ (former name for Mauritius). Three distinct specimens are in fact on the same sheet: the first (P00612300) is thus from
Ile de France
(Mauritius) while the two others (P00612301 and P00065013) are from
Bourbon
(La Réunion). Without a precise reading of all the original notes on the sheet, it is easy to consider that all the specimens come from La Réunion. In the 19th century, many plants collected in Mauritius were first transferred to Bourbon before being sent to Europe and this could explain potential confusion. On the sheet present at P, it is clearly indicated that the Mauritian specimen has been sent to Willdenow who published in 1810 the name
Trichomanes sibthorpioides
. If the type corresponds well to the Berlin specimen, its real origin (La Réunion or Mauritius) remains ambiguous and questionable.