New Fern Records for the State of Zacatecas and San Luis Potosi, Mexico

2010·0.62 MB·English

by  Leticia Pacheco

Shorter Notes
New
Fern Records
for the State of Zacatecas and San Luis Mexico.—
Potosi,
Based on made we
recent collections in the last two years, have found two
species that are recorded for the first time from the states of Zacatecas and San
Luis Potosi, Mexico. Our taxonomic and
distributional standard has been
the
Mexican New
pteridoflora by Mickel and Smith (Mem. York
Card. 88:686-
Bot.
which
692. 2004), includes both a general range statement and
the state-level
distribution of each taxon based on cited voucher specimens.
Mickel and Smith
(2004) treated eight species of the genus Woodsia
as
occurring in Mexico. The genus widely
distributed in north temperate
is
regions and higher elevations in the tropics. Woodsia phillipsii Windham was
known New
previously from Arizona, Mexico and Texas in USA, and widely
is
distributed Mexico, from
in Baja California Norte, Baja California Sur,
Chihuahua,
Coahuila, Durango, Mexico, Michoacan and
Jalisco, Sonera, but
has not been documented previously from
Zacatecas.
This species characterized by stramineous
narrowly
is stipe bases, linear to
oblong
blades, translucent projections on pinnule margins mostly
multicellu-
form
lar, often to filaments, indusial lobes filamentous most of their length and
far exceeding the sporangia and 7-18 pairs of pinnules. Our specimens match
the description except which 45-50
for the spores, are \im bigger than those
described. Mickel and Smith
(2004) discuss these plants with larger spores as
possible
allotetraploid hybrids.
The
voucher specimens Woodsia
of the population were
phillipsii collected
km
Municipio
at Jerez de Garcia Sahnas, 2 from El Cargadero Dam, 22 43'N,
W
103 06' {Pacheco et al, 3843 UAMIZ; Perez-JaramiUo 55 UAMIZ). The
et
al.
plants were growing in secondary Quercus 2331 m. The
forest population
at
occupies
a small area, but the plants are abundant.
On
the other hand, Didymoglossum known
petersii (A. Gray) Copel. from
is
southeastern United States to Costa Rica, but in Mexico has only been reported
from Chiapas, Puebla and The documented
Veracruz.
distribution
likely
is
biased because
of the small size of the plants that has resulted in under
collection of the species by botanists. Frequently grows on
the walls of
it
calcareous sinkholes 1400-2200 m.
at
Didymoglossum
Didymoglossum
petersii is related to ovale E. Fourn. in
its
small size, the lack of submarginal veins and the presence of marginal
stellate
but
hairs, differs in lack of dark involucral margins.
its
Didymoglossum
was
petersii discovered in San Luis Municipio
Potosi,
Xilitla, Manantial de San Antonio, 21 22'N, 99 OO'W [Pacheco 3886
et
al.,
UAMIZ;
Sanchez-Morales et 244 UAMIZ). The tiny plants were growing
al. as
trunk epiphytes on the north side of the stream wet montane
in forests
at
m.—
1140 Leticia Pacheco and Andres SAnchez-Morales, Universidad Auton-
oma
Metropolitana-Iztapalapa, Depto. de Biologfa, Area de Botanica
Estruc-
tural y Sistematica Vegetal. Apdo. Postal 55-535, 09340 Mexico, D. Mexico.
F.,