Trichomanes ribae (Hymenophyllaceae), a New Filmy Fern from Costa Rica and Panama

2 Pages·2002·1 MB·English

by  Leticia Pacheco

American Fern Journal 92(4):294-295 [2002)
Shorter Notes
New
Trichomanes rihae (Hymenophyllaceae), a Filmy Fern from Costa Rica
—
and Panama. The Hymenophyllaceae and Panama
Costa Rica well
in are
known
due works 185-228. and
to the of Leilinger (Pteridologia 1989]
2:
Pacheco [in G. Davidse, M. Sousa S., and S. Knapp, eds. Flora Mesoamericana,
Autonoma
voL Psilotaceae a Salviniaceae. Univ. Nacional de Mexico,
1.
Mexico, D. F. Pp. 62-83. 1995). However, as a result of additional studies
new
during a recent trip to Costa Rica, a species has been identified.
—
Trichomanes [Trichomanes] rihae Pacheco, nov. TYPE. Panama:
sp.
km
NE
Panama, 5-10 of Altos de Pacora, on trail at end road, 750 m, 7
&
Mar 1975, Mori Kallunki 4964, (holotype, MO).
S. (Fig.
1)
J.
cm
Rhizoma
repens, diametro, trichomatibus remota, 4.8-
0.1 catenatis; folia
X X
11.5 2.7—3.8 cm; petioli 0.08—0.5 0.05 cm^ trichomatibus catenatis; laminae
cm
4.7-11 lanceolatae, 2-pinnatifidae, apice pinnatifidae, basi subtruncatae;
rachis pinnae oblongo-lanceolatae, imbricatae; 1—4 per pinnam,
alata; sori in-
x
volucris in lobis immersi, 0.2-0.25 0.2 cm, campanulatis, receptaculo exserto.
cm
Rhizome
long creeping, 0,1 in diameter with catenate trichomes; leaves
X X
distant, 4.8-11.5 2.7-3.8 cm; petioles 0.08-0.5 0.05 cm, nonalate, loosely
brown
and deciduously clothed with catenate trichomes, similar trichomes on
rachis and veins; blade lanceolate, 4.7—8.3 cm, 2-pinnatifid, chartaceous, apex
cm
pinnatifid, base subtruncate; rhachis alate, wings 0.07-0.08 wide on either
X
pinnae 11-18 on below
side; oblong-lanceolate, a side the apex, 1.2-1.6
0.7,
overlapping at in right angles to rhachis, their apices pinnatifid; segments
X
oblong, 0.15-0.18 0.1-0.18 cm, apex obtuse plane, margins
to bifid,
complete; venation open, anadromous, pinnate, veins not reaching
2-furcate,
lamina
the apices of the lobes; cells almost isodiametric, translucent; sori
cm
on 1-4 X
the pinnae, per pinna, involucres immersed, 0.2-0.25
lateral 0.2
campanulate, apex
wide-flaring; receptacle exserted.
—
COSTA
Paratype. RICA: Limon; Siquirres, Las Brisas de margen izquierda
Quebrada Camino
de Jesus, afluente innominado, a Cerro Tigre. 09'' 56' 40" N;
W,
83" 25' 15" 800 m, 22 Mar. 1996, G. Herrera 8849 G. Valverde (CR).
Er
Trichomanes
rihae belongs subgenus Trichomanes evidenced by
to as the
anadromous
on and
venation, sori lateral the pinnae, distant leaves, 2-
pinnatifid lamina. Its nearest relative is T. rupestre [Raddi) Bosch from which
differs by shorter leaves, 1—4 sori per pinna, and campanulate immersed
it
involucres with wide-flaring apex. This species always epiphytic while
is
T. rupestre is epipetric or terrestrial, but not epiphytic. This species dedica-
is
Ramon
Nava
ted Riba Esparza.
to y
This work was supported by the Instituto Nacional de Biodiversidad, Costa
Zamora
Rica, Nelson provided financial and logistic help. thank Rolando
I
—
RANKER GAMETHOPHYTE
ET SEXUALITY
AL.: 295
^.Ji/pp
view pinna with campanulate immersed
Trichomanes habit; b) general of leaf; c)
Fig. ribae. a]
1.
involucres with wide-flaring apices. Trichomanes rupestre. d] pinna with involucres.
new am
Jimenez for the drawings that illustrate this species. I also grateful to
Fernando Chiang the Latin translation of the species diagnosis. Leticia
for
Pacheco. Departamento de Biologia-Botanica Estructural y Sistematica Vegetal,
Universidad Autonoma Metropolitana-Iztapalapa, Apdo. Postal 55-535, 09340
Mexico
Mexico.
D.
F.,