. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 10 was found among these hyphae and was abundant also in liquid cultures These spores were ovate to orbicular and usually very dark. They averaged 24 M in length, and often had one or more hyphal cells attached to their distal end. A graded pH series was set up with Elliott's medium (3), which contains asparagin as a nitrogen source; and a second series was run with 2 per cent '"1*ttJ,''* J^^^^ °'""*^'^ *''°'" *''"'^ '"^''â ^ «"
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 10 was found among these hyphae and was abundant also in liquid cultures These spores were ovate to orbicular and usually very dark. They averaged 24 M in length, and often had one or more hyphal cells attached to their distal end. A graded pH series was set up with Elliott's medium (3), which contains asparagin as a nitrogen source; and a second series was run with 2 per cent '"1*ttJ,''* J^^^^ °'""*^'^ *''°'" *''"'^ '"^''â ^ «"d the pH was adjusted with HCl and NaOH. The malt series of 12 pH values from to showed growth from to , although growth was slow at the extremes of the range, particularly at the acid end. Optimum growth occurred between 5 5 and On Elliott's medium at pH values from to , growth was obtained from to , with an optimum range betweeen and 6 5 The malt series was inoculated with mycelium, while conidia were used with Ji»lliott s medium. Growth of different cultures of the fungus collected from various locali- ties showed no tendency toward morphological variation when grown upon 2 per cent malt agar in Petri dishes. Numerous varieties of Dematium pullulans have been described, but the variety with which we are here con- cerned cannot be placed satisfactorily among these. In the character of its nodose hyphae it resembles var. fimicola Marchal, but differs markedly from It m spore characters. EXTENT OF FORKING IN STANDS A partial summary of data obtained from some of the plots studied on the Roches er Watershed is given in table 1. It is evident from data upon plots L and D that the more vigorous trees are the most susceptible to fork- ' 'Tr^ '" ^^^^^ *' '"''' ^^ ^^^ ^^ '^' ^^' ^^^^P« ^t^^died, although quantitative data are not available for trees of the older classes. wateli^^ 1-^ of forlcing with related data
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Keywords: ., bookcentury1900, bookpublisherphiladelphiasn, booksubjectbotany
