. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. 48 Caribbean Forester. Fig. 1.—Grove of alder along stream near Chichicastenango, Guatemala. This is the Tropical lower montane moist forest with pines and oaks on the hills. (Arbolado de jaul a lo largo de un arroyo cerca de Chichicaste- nango, Guatemala. Este es el bosque tropical pedemontano semihumedo, con pinos y robles en las colinas.) year, they may assume large dimensions. In the alder, they may be as big as a cricket ; Recent general references, such as Skene'
. The Caribbean forester. Forests and forestry Caribbean Area Periodicals; Forests and forestry Tropics Periodicals. 48 Caribbean Forester. Fig. 1.—Grove of alder along stream near Chichicastenango, Guatemala. This is the Tropical lower montane moist forest with pines and oaks on the hills. (Arbolado de jaul a lo largo de un arroyo cerca de Chichicaste- nango, Guatemala. Este es el bosque tropical pedemontano semihumedo, con pinos y robles en las colinas.) year, they may assume large dimensions. In the alder, they may be as big as a cricket ; Recent general references, such as Skene's, accept nitrogen fixation on alder roots as a fact, but a search through Biological Abs- tracts turned up contradictory statements indicating that the macter is not completely settled. Roberg (3) in 1938 wrote that Ac- tinomyces alni in experiments produced no- dules on the four European alder species, A. piutinosa, A. incana, A. cor data and A. viriais. In a previous publication on ino- culation experiments, he had suggested the name, Actinomyces alni. Subsequently, Plo- tho (4) supported the findings of Roberg with cultural and inoculation studies. How- ever, in a still more recent abstract, Bou- wens (5) questions the work of Plotho and describes his own negative results with A. alni. In July 1950, several of these tubercles were obtained from alder roots in a pasture near Tres Rios, Costa Rica. Dr. Pierre Syl- vain, Physiologist at the Institute, kindly determined the nitrogen content of one sample of the nodules or tubercles and another sample of the alder roots from which the nodules were removed. The total nitrogen, including N03, was determined with the following results: A. acuminata Nodules from these roots The results were derived from single anal- yses, but, at least, are indicative of the de- finite probability of enrichment of the soil through the nodules on A. acuminata. There is also the possibility that the nitrogen con- tent may vary
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