Difference between revisions of "Isoëtes flaccida"
Flora 29: 178. 1846.
RevisionBot (talk | contribs) m (Bot: Adding category Revision Pending) |
RevisionBot (talk | contribs) m (Bot: Adding category Revised Since Print) |
||
| (One intermediate revision by one other user not shown) | |||
| Line 1: | Line 1: | ||
{{Treatment/ID | {{Treatment/ID | ||
|accepted_name=Isoëtes flaccida | |accepted_name=Isoëtes flaccida | ||
| − | |accepted_authority=A. Braun | + | |accepted_authority=Shuttleworth ex A. Braun |
|publications={{Treatment/Publication | |publications={{Treatment/Publication | ||
|title=Flora | |title=Flora | ||
| Line 37: | Line 37: | ||
-->{{#Taxon: | -->{{#Taxon: | ||
name=Isoëtes flaccida | name=Isoëtes flaccida | ||
| − | |authority=A. Braun | + | |authority=Shuttleworth ex A. Braun |
|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
| Line 50: | Line 50: | ||
|publication year=1846 | |publication year=1846 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_190.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes flaccida | |species=Isoëtes flaccida | ||
| Line 60: | Line 60: | ||
[[Category:Isoëtes]] | [[Category:Isoëtes]] | ||
[[Category:Revised Since Print]] | [[Category:Revised Since Print]] | ||
| − | |||
Latest revision as of 19:38, 6 November 2020
Plants aquatic, emergent. Rootstock nearly globose, 2-3-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged to 60 cm, pliant, gradually tapering to tip. Velum covering entire sporangium. Sporangium wall unpigmented. Megaspores white, 250–500 μm diam., tuberculate to rugulate; girdle smooth. Microspores light brown in mass, 25-33 μm, papillose. 2n = 22.
Phenology: Spores mature in summer.
Habitat: Emergent or in shallow water of lakes, ponds, streams, ditches, and marshes
Discussion
Isoëtes flaccida includes individuals with a variety range of megaspore sizes and textures. Although megaspores are fairly uniform among individuals within a population, considerable variation occurs between populations. A local Florida population with megaspores that are nearly smooth on the proximal faces and low-tuberculate on the distal hemisphere has been described as I. flaccida var chapmanii Engelmann. Isoëtes flaccida var. alata (Small) N. E. Pfeiffer has included plants in which the megaspores are densely tuberculate to rugulate on the proximal faces and have bold, anastomosing ridges on the distal hemispheres.
Isoëtes flaccida hybridizes with I. engelmannii
Selected References
None.