Pollen are monomorphic, tricolporate and angulaperturate. OS is lolongate. L—O pattern is noted.
Pollen are monomorphic, tricolporate and angulaperturate. OS is lolongate. L—O pattern is noted.
A mature stand of mesic southern mixed hardwoods was sampled using the quarter method for trees and quadrats for the shrubs. The relative dominance, the relative density and the relative frequency were determined for the trees. The most important tree genera were Fagus, Magnolia, Quercus, Liquidambar, Carya, and Pinus. The most abundant shrub was Illicium floridanum.
The predominant tree groups were beech, magnolia, oak, sweetgum, hickory and pine, although pines were established only during the early stages of succession. The species found correlated closely with the 1810 survey witness trees. The forest is in a late stage of succession. It has been almost entirely excluded from large disturbing factors, although small areas are constantly reverting to an earlier stage of succession, mostly through the opening of the canopy caused by dead or fallen trees.
Cheilanthes castanea is reported for the first time from Virginia and West Virginia. The nearest previously known stations are in Oklahoma. A distribution map and list of specimens and a key to C. castanea, C. lanosa, and C. tomentosa are included.
A track abandoned for two years had a sparse (av. 61.8 per 100 M2) growth. Of 40 species listed in 500 sq. m., Chenopodium strictum, Taraxacum officinale and Kochia scoparia were most common.
The study area includes a somewhat limited area along Lusk Creek which is located in southeastern Illinois in north-central Pope County. The area extends through sections 3, 10, 27, 28, 33 and 34 of Township 11 South, Range 6 East (Fig. 1). The area features a clear rock-bottom stream with several tributaries, massive bluffs of Pennsylvanian sandstone, deep ravines, mesic woods, old fields, and pine plantations. It covers approximately 1,400 acres and is managed for the most part by the United States Forest Service.
In August, 1968, my son and I found large stands of Potamogeton oakesianus Robbins growing in the third backwater of Cheat Lake, Monongalia County, near Morgantown, W. Va.
This is the first and only comprehensive work on the vascular plants of New England and should prove most useful to students of the fascinating flora, ranging all the way from sea level to the top of Mount Washington. The author is Associate Curator of the Pringle Herbarium at the University of Vermont and a former president of The New England Botanical Club; his qualifications speak highly for the accuracy of this work.
This excellent text is similar to The Living Cell (see Castanea, vol. 31, 1966. Pg. 250), in that it is a volume of reprints from the Scientific American magazine.
Since quantitiative research has been made possible by modern computers, the older science of statistics, designing experiments to produce valid numerical results, has become important to nearly all researchers.
The taxonomy of grasses has been in an upheaval since Avdulov and Prat published their chromosomal and morphological studies in the grasses. Along with others, both of these researchers showed that the old morphological groups of grasses (tribes and genera) were not accurate phylogenetically, but the present text is the first comprehensive text to utilize this research material.