Appendices & Glossary - Botanical Research Institute of Texas

APPENDIX TWELVE
SPECIES OF PTERIDOPHYTES, GYMNOSPERMS, AND
MONOCOTS OF CONSERVATION CONCERN OCCURRING
IN EAST TEXAS
The following list contains 99 species (115 total taxa—species, subspecies, and varieties) of pteridophytes,
gymnosperms, and monocots that we consider to be of conservation concern in East Texas.
These represent 9.3% of the total 1,060 species and 10.2% of the total 1,131 taxa treated in Volume 1. Dicots
of conservation concern will be listed in Vols. 2 & 3.
A taxon (species, subspecies, or variety) is included in this list if:
1) It is cited in the botanical literature as being rare, threatened, endangered, or of conservation concern.
In these cases, the reference is given. References of particular importance include Poole et al.
(2002) and Carr (2002d). In order to stress the rarity of the plants under discussion, these two key references
are cited in the taxonomic treatments and in the list below as RARE 2002a and RARE 2002b
respectively.
2) Its distribution in Texas is so limited that we consider it to be of conservation concern in the state.
This is indicated in the text by the abbreviation IFET (Illustrated Flora of East Texas). In general, our
criterion is that if a native species, subspecies, or variety is known to us in Texas from three or fewer
counties, it is included in this list. In a few cases, as noted in the text, additional species are included for
various reasons. We realize that a “three county” guideline is somewhat arbitrary and not always the
best criterion. In some cases a taxon, though present in only three counties, may be locally abundant.
In other instances, a taxon occurring in four or more counties may be quite rare throughout its range.
However, given the paucity of collections and lack of distributional data about many plants in Texas,
this is at least a first attempt at pointing out taxa not previously recognized as of possible conservation
concern in the state. Hopefully, the material presented here will stimulate collectors to provide additional
collections and information.
Taxa are listed in alphabetical order within three categories: ferns and related plants, gymnosperms,
and monocots.
Taxa whose scientific names occur in italics are known immediately adjacent to the flora area but
not from it. They are mentioned in the treatments and here as “notes” to provide as much information
as possible.
Conservation concern designations (e.g., G2525SOC), if available, are given. A key to these designations
can be found on pages 20 and 21 of introduction to this volume.
Additional information about the following species of conservation concern can be found with the
species descriptions in the taxonomic treatments.
E Indicates taxa endemic to Texas; T Indicates taxa endemic to East Texas
PTERIDOPHYTES
Cheilanthes aemula Maxon, TEXAS LIP FERN, RIVAL LIP
FERN. IFET.
Cystopteris protrusa (Weatherby) Blasdell, SOUTH-
ERN BLADDER FERN, LOWLAND BLADDER FERN, LOWLAND
BRITTLE FERN. IFET.
Dryopteris celsa (W. Palmer) Knowlton, W. Palmer &
Pollard, LOG FERN. IFET.
Isoetes butleri Engelm., BUTLER’S QUILLWORT. IFET.
Isoetes lithophila N. Pfeiff., ROCK QUILLWORT. ( TOES
1993: V; RARE 2002a: G2S2SOC) e
Lycopodiella prostrata (R.M. Harper) Cranfill, CREEP-
ING CLUB-MOSS, PROSTRATE BOG CLUB-MOSS, SOUTHERN
CLUB-MOSS, FEATHER-STEM CLUB-MOSS. IFET.
Palhinhaea cernua (L.) Vasc. & Franco, NODDING
CLUB-MOSS, STAG-HORN CLUB-MOSS. IFET.
Psilotum nudum (L.) P. Beauv., WHISK-FERN. IFET.
Tectaria heracleifolia (Willd.) Underw., BROAD
HALBERD FERN. IFET.
GYMNOSPERMS
No East Texas gymnosperms are of conservation
concern.