Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 3 1877 - Umbelliferae-Eben

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 4 (1-4) 1902-04 - Ola-Gentianeae

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 4 (1-3) 1905-06 - Hydrophyll-Pedalineae

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 5 (1-3) 1899-1900 - Acanth-Plantagineae

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 6 (1-6) 1909-13 - Nyctagineae-Euphorbi

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 6 (1-2) 1916-17 - Ulm-Cycad

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 7 (1-3) 1897-98

Flora of tropical Africa /by Daniel Oliver ... assisted by other botanists.

v. 8 (1-3) 1901-02 - Pontederi-Cyper

Mensurações dos traqueídos de Pinus Elliottii pelo método microscópico

O presente trabalho trata-se da comparação dos traqueídos de Pinus elliottii procedida pelo método microscópico em material dissociado, empregando-se dois critérios diferentes, com a finalidade de se saber qual dos dois, seria mais vantajoso e mais rápido devido a troca constante de objetivas de aumentos diferentes para se obter os valores dos comprimentos e das espessuras. Pelo primeiro critério tanto o comprimento como a espessura foram tomadas do mesmo elemento, e pelo segundo as medidas do comprimento e das espessuras não foram tomadas necessàriamente dos mesmos elementos. A análise estatística provou ser os dois critérios corretos. Sendo o segundo critério mais, fácil e rápido que o outro, vê-se portanto ser perfeitamente apropriado o seu emprego nos nossos futuros trabalhos de mensurações dos elementos do xilema pelo método normal do microscópio.

The relation of the concentration of macronutrients in the substrate and in the foliage to cell wall thickness and cellulose concentration in the xylem of slash pine (Pinus elliotti)

Sand culture experiments, using a sub-irrigation technique, were installed in order to find out the effects of the macronutrients N, P, K, Ca, Mg and S on growth, aspect, mineral composition, length of fibers, thickness of cell wall and cellulose concentration in slash pine. The aim was to obtain, under controlled conditions, basic information which could eventually lead to practical means designed to increase the rate of growth and to make of slash pine a richer source of cellulose. Nitrogen, Phosphorus, Potassium Experiment A 3 x 3 x 3 factorial design with two replicates was used. Nitrogen was supplied initially at the levels of 25, 50 and 100 ppm; phosphorus was given at the rates of 5, 10 and 20 ppm; potassium was supplied at the rates of 25, 50 and 100 ppm; six months after the experiment was started the first level for each element was dropped to zero. Others macro and all micronutrients were supplied at uniform rates. Fifteen hours of illumination per day were provided. The experimental technique for growing the slash pine seedlings proved quite satisfactory. Symptoms of deficiency of nitrogen, phosphorus and potassium were observed, described and recorded in photographs and water colors. These informations will help to identify abnormalities which may appear under field conditions. Chemical analysis of the several plant parts, on the other hand, give a valuable means to assess the nutritional status of slash pine, thus confirming when needed, the visual diagnosis. The correctness of manurial pratices, on the other hand, can be judged with the help of the analytical data tabulated. Under the experimental conditions nitrogen caused the highest increases on growth, as measured by increments in height and dry weights, whereas the effects of phosphorus and potassium were less marked. Cellulose concentration was not significantly affected by the treatments used. Higher levels of N seemed to decrease both length of fiber elements and the thickness of cell wall. The effects of P and K were not well defined. Calcium, Magnesium, Sulfur Experiment A 3 x 3 x 3 factorial design with two replicates was used. Calcium was supplied initially at the levels of 12.5, 25 and 50 ppm; magnesium and sulfur were given at the rates of 6, 12.5 and 25 ppm. Other macro and micronutrients were supplied at uniform rates, common to all treatments. Three months after starting the experiment the first level for each element was dropped to zero. Symptoms of deficiency of calcium, magnesium and sulfur were observed, described and recorded as in the case of the previous experiment. Chemical analysis were made, both for mineral content and cellulose concentration. Length of fibers and thickness of cell wall were measured. Both calcium and magnesium increase height, sulfur failing to give significant response. Dry weight was beneficially affected by calcium and sulfur. The levels of calcium, magnesium and sulfur in the needles associated with deficiency and maximum growth are comparable with those found in the literature. Cellulose concentration increased when the level of sulfur in the substrate was raised. The thickness of cell wall was negatively affected by the treatments; no effect was observed with regards to length of fibers.

Tropical American plants, II / Louis O. Williams.

v.29:no.6(1961)

Tropical American plants, X / Louis O. Williams.

v.32:no.4(1968)

Tropical American plants, XI / Louis O. Williams.

v.32:no.12(1970)