Ceratopteris thalictroides
Description
Plants generally on mud, sometimes in shallow water; stipes 0.7–8 mm wide, about the same width throughout their length; sterile fronds ca. 6–60 X 5–20 cm; sterile blades (1–)2–3-pinnate, the proximal pinnae alternate; buds absent or usually dormant on actively growing blades, generally developed only on senescent blades; fertile fronds usually ca. 15–60 X 10–35 cm, pinnae 4–6 pairs, ascending, proximal pairs subopposite; sporangia with annuli of 15–70 clearly indurate cells; spores 32 per sporangium; 2n=156 (Hawaii, Japan).B
B. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Discussion
Citation of this species from Guerrero by Lorea-Hernández & Velázquez M. (1998) was based on a specimen they identified as C. pteridoides; they did not cite the Fonseca collection cited above, which was collected in 1989. Lellinger (1989) and Moran (in Davidse et al., 1995) cited Mexico (Tabasco) in the range of C. thalictroides, but no specimens have been seen from there; the citation by Moran was based on Cowan (1983), but these specimens are all C. pteridoides. Another possible record of C. thalictroides from Mexico is a specimen from Tamaulipas, “presa Vicente Guerrero, en El Campo recreativo Morris, 2 km de V. casas, Mpio., Villa de Casas,” 250 m, Martínez 929 (MO), but the specimen is poor, sterile, and of uncertain identity.
Stolze’s (1981: 125) illustration of “C. thalictroides” is similar to the Chiapas collection identified here as C. pteridoides, and it seems possible the specimen on which the illustration was based is misidentified. Sterile fronds of C. thalictroides are generally more finely divided with much narrower segments than those of C. pteridoides, and the stipes are not inflated.
C
C. SEMARNAT 2019: MODIFICACIÓN del Anexo Normativo III, Lista de especies en riesgo de la Norma Oficial Mexicana NOM-059-SEMARNAT-2010: 101 pp. – https://www.dof.gob.mx/nota_detalle.php?codigo=5578808&fecha=14/11/2019#gsc.tab=0 [accessed 2023-05-04 06:16]
Stolze’s (1981: 125) illustration of “C. thalictroides” is similar to the Chiapas collection identified here as C. pteridoides, and it seems possible the specimen on which the illustration was based is misidentified. Sterile fronds of C. thalictroides are generally more finely divided with much narrower segments than those of C. pteridoides, and the stipes are not inflated.
C
Habitat & Ecology
In slow-moving rivers or streams.E
E. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Specimen
Gro (Fonseca 1643, FCME).
Unverified, Doubtful, or Mistaken Reports. Oax (Pérez-García 1033, MEXU, cited by Tejero-Díez & Mickel, 2004, but not verified). Tab (reported by Magaña, 1992, probably based on a misidentification of C. pteridoides).
F
F. Mickel, J. T. & Smith, A. R. 2004: The Pteridophytes of Mexico Vol. 88
Unverified, Doubtful, or Mistaken Reports. Oax (Pérez-García 1033, MEXU, cited by Tejero-Díez & Mickel, 2004, but not verified). Tab (reported by Magaña, 1992, probably based on a misidentification of C. pteridoides).
F