Isoetes naipiana (Isoetaceae), a new species from southern Brazil, is described, illustrated and compared to similar species. So far it is known only from the original locality in the open grasslands of the upper highlands in the NE region of the State of Rio Grande do Sul (Brazil). It is characterized by megaspores with an irregular reticulum on the surface, presenting deposition of thin parallel silica strands; laevigate microspores; and arcuate microphylls with shortly alate bases, forming a compact rosette around the erect bilobate corm.
References
J. M. Budke
,
R. J. Hickey
&
K. D. Heafner
2005: Analysis of morphological and anatomical characteristic of Isoetes using Isoetes tennesseensis. —
Brittonia. 57: 167–182 Google Scholar
H. P. Fuchs-Eckert
1986: Isoetáceas. — Pp. 1–42 in:
R. Reitz
(ed.),
Flora ilustrada Catarinense. — Itajaí: Herbário Barbosa Rodrigues. Google Scholar
R. J. Hickey
1986:
Isoetes megaspore surface morphology: nomenclature, variation, and systematic importance. —
Amer. Fern J.
76: 1–16. Google Scholar
R. J. Hickey
,
C. C. Macluf
&
M. Link-Pérez
2009:
Isoetes maxima, a new species from Brazil. —
Amer. Fern J.
99: 194–199 Google Scholar
R. J. Hickey
,
C. C. Macluf
&
W. C. Taylor
2003: A Reevaluation of Isoëtes savatierii Franchet in Argentina and Chile. —
Amer. Fern J.
93: 126–136 Google Scholar
IUCN 2012: IUCN Red List categories and criteria: Version 3.1, ed. 2. — Gland & Cambridge: IUCN. Google Scholar
D. B. Lellinger
2002: A modern multilingual glossary for taxonomic pteridology. — Pteridologia 3A: 1–264. Google Scholar
M. L. Lorscheitter
,
A. R. Ashraf
,
R. M. Bueno
&
V. Mosbrugger
1998: Pteridophyte spores of Rio Grande do Sul flora, Brazil, part I. — Palaeontographica 246: 1–113. Google Scholar
M. L. Lorscheitter
,
A. R. Ashraf
,
P. G. Windisch
&
V. Mosbrugger
2009: Pteridophyte spores of Rio Grande do Sul flora, Brazil, part VI. — Palaeontographica 281: 1–96. Google Scholar
J. B. S. Pereira
2012: Taxonomia e cariologia do gênero Isoetes L. nas regiões sul e sudeste do Brasil. — Curitiba: Dissertation, Universidade Federal do Paraná. Google Scholar
J. B. S. Pereira
,
P. G. Windisch
,
M. L. Lorscheitter
&
P. H. Labiak
2012:
Isoetes mourabaptistae, a new species from southern Brazil. —
Amer. Fern J.
102: 174–180 Google Scholar
J. Prado
&
L. Sylvestre
2010:
Isoetaceae. — Pp. 541–541 in:
R. C. Forzza
[& al.],
Catálogo de plantas e fungos do Brasil 1. — Rio de Janeiro: Jardim Botânico do Rio de Janeiro. Google Scholar
J. Prado
,
L. Sylvestre
&
J. B. S. Pereira
2011:
Isoetaceae. — In: Lista de espécies da flora do Brasil. — Jardim Botênico do Rio de Janeiro: published at http://floradobrasil.jbrj.gov.br/jabot/floradobrasil/FB91270 [accessed 7 Jan 2014]. Google Scholar
A. F. Tryon
&
B. Lugardon
1990: Spores of the Pteridophyta. Surface, wall structure, and diversity based on electron microscope studies. — New York: Springer. Google Scholar
