477) sampled in 1977, in 25 cm deep water near the North shore of the lake, revealed a mass presence of submerged
Isoetes karstenii A.Braun (cover 75%) and Herbertus obtusifolius (cover 35%).
Los lagos se encuentran altitudinalmente entre 3 200 y 3 600 msnm; en su zona litoral se observan rocas, raices de plantas terrestres, detritos, sedimento y plantas acuaticas principalmente de los generos Myriophyllum, Potamogeton, Elatine,
Isoetes y Sphagnum.
Las turberas de paramo suelen estar rodeadas por plantas que forman almohadillas de los generos Planta go, Oreo bolus y Azorella y de plantas semilacuaticas como
Isoetes. Todas ellas pueden soportar las condiciones ambientales imperantes que ya describimos: poco oxigeno y nutrientes, mucho frio, agua y acidez creadas en gran parte por la presencia del musgo Sphagnum.
Occurrence of
Isoetes echinospora Durieu and Subularia aquatica L.
The spores of Pteridophyta,
Isoetes and Sphagnum were counted and quantified as percentages based on the pollen sum.
(2005) for conflicting data on
Isoetes. The majority of pteridophytes are shown to have an amoeboid tapetum (Parkinson & Pacini, 1995), however, many homosporous ferns have globular bodies in their sporangial locules that were considered to be homologous to orbicules in spermatophytes (Lugardon, 1981).
Adamec, "The incidence of arbuscular mycorrhiza in two submerged
Isoetes species," Aquatic Botany, vol.
Constant species:
Isoetes echinospora, Potamogeton perfoliatus, Subularia aquatica.
Por otra parte, algunas especies que restringen su area a zonas de alta montana, como Callitriche heterophylla,
Isoetes mexicana, Jaegeria glabra, Ranunculus hydrocharoides y R.
Isoetes melanopoda, Croomia pauciflora, Brickellia cordifolia, and Stewartia malacodendron were not re-located.
Characeae N SPHENOPSIDA Equisetum bogotense Equisetaceae N Kunth FILICOPSIDA Blechnum penna-marina Blechnaceae N (Poir.) Kuhn
Isoetes savatieri Franch.
In the latter case, for example, no species of
Isoetes were reported for Mississippi in 1969, and today three are recognized, with the potential of several more.
Isoetes - type and genus of the Isoetaceae and sole extant genus of the order Isoetales