For example, studies have suggested that the monocots are positioned in a clade with Nelumbo and Ceratophyllum
(Hamby and Zimmer, 1992), sister to the paleoherbs (Chase et al.
Records of depth limits for different taxa (Database of the Centre for Limnology) Taxon Maximum Lake, year growth depth, m Ceratophyllum
The pond is dominated by dense populations of Ceratophyllum
demersum (Coontail),Wolffia columbiana(Water-meal), and Spirodela punctata (Duckweed).
Aquatic macrophytes found along the streams, include Berula erecta, Ceratophyllum
demersum, Chara sp.
0' denotes absence and '1' presence Taxon Habitat 1 2 3 4 5 Aglaothamnion roseum (Roth) Maggs & L'Hardy-Halos 1 0 0 1 0 Battersia arctica (Harvey) Draisma 1 1 1 1 1 Ceramium tenuicorne (Kiitzing) Waern 1 1 0 1 1 Ceramium virgatum Roth 1 0 0 1 1 Ceratophyllum
demersum Linnaeus 0 0 1 1 1 Chaetomorpha linum (0.
The positions of Ceratophyllum
and Chloranthaceae inferred from phytochrome data.
Species groups followed the flooding gradient from the mesic Chasmanthium group to the aquatic Ceratophyllum
group (Table 1, Figure 5).
A detailed map of the macrophyte cover from 1988 (Maemets, 1991) shows that in the northern part of Lake Verevi charophytes were replaced by Ceratophyllum
Brasenia schreberi, Vallisneria americana, Chara braunii, Ricciocarpus natans, Ceratophyllum
echinatum, and Zannichellia palustris were the rarest species, occurring at <5% of the survey sites, with the latter four species having been recorded from only a single site.
SC/NM 4 N V R SpSu CERATOPHYLLACEAE Ceratophyllum
For instance, seeds of Ceratophyllum
demersum were represented in low numbers but uniformly.
Later inundation of the forest was indicated by the appearance of fish (Perca flavescens), meadow voles (Microtus pennsylvanicus), and submergent aquatic macrophytes (Myriopyllum exalbescens, Potamogeton pusillus, Ceratophyllum
demersum, and Najas flexilis).
Utricularia vulgaris, Ceratophyllum
demersum and Chara species.
Several aquatic species--namely, Ceratophyllum
If the PhyloCodeers had named angiosperms based on the rbcL tree (Ceratophyllum
+ Aster, say), then we could have actually ended up with a classification in which the name "angiosperm" applied to Ceratophyllum
+ tricolpates--even though the original group they wished to name (all angiosperms) was still monophyletic