Results 181 to 190 of about 3,214 (220)
Some of the next articles are maybe not open access.
Systematics of the Pteridophytes
1982Detailed investigations of a limited alliance of plants often lead to the discovery of new differentiating characters. These are then not rarely strongly emphasized in the process of evaluation, the points of similarity being underrated. This usually leads to the establishment of new genera and even families, the former resulting in many new ...
openaire +1 more source
Introduction to Pteridophytes and Gymnosperms
1990There is a broad consensus about the delimitation of vascular plants as against thallophytes, and their major subdivisions are well-established. Living pteridophytes are conveniently subdivided into (true) ferns and fern allies, the latter formed by lycopods, horsetails and psilotates.
Karl Ulrich Kramer, P. S. Green
openaire +1 more source
1990
Pteridophytes have evolved to fill almost every ecological niche but the greatest species diversity is clearly found in the tropical rainforest. The rapid disappearance of this biome throughout the world with many of their pteridophyte species yet undiscovered, let alone described, is of great concern.
openaire +1 more source
Pteridophytes have evolved to fill almost every ecological niche but the greatest species diversity is clearly found in the tropical rainforest. The rapid disappearance of this biome throughout the world with many of their pteridophyte species yet undiscovered, let alone described, is of great concern.
openaire +1 more source
Systematics of the Pteridophytes
1999Several important conferences were devoted to various fields of pteridology. Important papers of a biogeography symposium of 1990 were published in 1993 (see Sect. 4). A symposium entitled Use of Molecular Data in Evolutionary Studies of Pteridophytes was held in Knoxville in 1994.
openaire +1 more source
Notes on California Pteridophytes
American Fern Journal, 1937This paper includes discussion of the distribution of several California pteridophytes. Several new stations and one species new to California are reported. The writer is indebted to Dr. H. A. Gleason for looking up material at New York Botanical Garden, to Dr. Wm. R. Maxon and Dr. Norma E. Pfeiffer for making determinations, and to the curators of the
openaire +1 more source
The Ecology of Tropical Pteridophytes
1938By far the greatest bulk of literature on pteridophytes is systematic or morphological. Scattered through this literature is a good deal of information relevant from an ecological standpoint, but it is very scattered, and much of it may doubtless have been overlooked. The task of examining it all is an impossible one.
openaire +1 more source