. Bulletin. Natural history; Natural history. 101 tible influence on the number of conidia, though as it approached corn-meal agar conidia-production became profuse. NUTRIENTS AS AFFECTING CONIDIAL LENGTH, SEPTATION, AND SHAPE Plates of washed agar when solid were inoculated with H. No. 1, and when the colony had grown to a diameter of about 3 cm. one of ^arious nutrients was laid on the agar in approximately ecjual volume, at a distance of 1 cm. from the edge of the colony. When growth had ceased, graphs of conidial length were made. These graphs, with data sufficiently explana- tory, are giv
. Bulletin. Natural history; Natural history. 101 tible influence on the number of conidia, though as it approached corn-meal agar conidia-production became profuse. NUTRIENTS AS AFFECTING CONIDIAL LENGTH, SEPTATION, AND SHAPE Plates of washed agar when solid were inoculated with H. No. 1, and when the colony had grown to a diameter of about 3 cm. one of ^arious nutrients was laid on the agar in approximately ecjual volume, at a distance of 1 cm. from the edge of the colony. When growth had ceased, graphs of conidial length were made. These graphs, with data sufficiently explana- tory, are given in Fig. H. While the number of measurements made is too small to warrant any definite conclusion as to nutritive values, the obvious general conclusion is that the added nutrient did markedly affect conidial length. It is particularly noticeable that washed agar plus saccharose, tapioca, or rice gave small conidia, and in none of these cases was modal conidial-length equal to that of conidia grown under standard conditions (see Fig. K). E\en the very striking modification represented by the bi- modal curve shown in Fig. I was a product of en\ ironmental change. It was noted in the sample from which the graph was plotted that the conidia were produced in rather large clusters, the oldest one being largest, the others mostly much smaller. The minor mode here apparently represents conidia in a stage of arrested de\'elopment, comparable with those of Graph 62 (Fig. 0), while the major mode stands for conidia that approached more nearly to normal development but did not attain full size (cf. graphs of Figs. I and O with those of Fig. K). That the bimodality is not due to. l-'iG. 4.—Tri-pointed conidia ofl H. No. 23 ;ind H. No. 36 (see text, p. 102).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois.
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