A Linnean Herbarium [stub]

Theo. Holm
1907 Botanical Gazette  
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more » ... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. g907] CURRENT LrTERATURE 395 A bacterial rot of the tomato is also described in this bulletin. The bacteria were isolated from tomatoes which showed no sign of fungus growth. They were cultivated in pure culture and when reinoculated into the tomato fifty out of a total of sixty-seven inoculations produced the characteristic disease. There are thus two distinct diseases: a rot due to Fusarium and another rot due to bacteria.-F. L. STEVENS. Root tubers of Dioscorea.-Some years ago QuFvA described the vegetative organs of certain species of Dioscorea, and reached the conclusion that the tuberous body which occurs at the end of some of the roots represents an organ which has changed its nature from root to "something else." The matter was taken up by GOEBEL, who explains this peculiar body as an organ whose morphology lies between a shoot and a root. A-much more simple and more natural explanation has recently been offered by LINDINGER,i8 who has studied D. discolor, and concludes that the roots do not change their morphological nature, but their function. The root consists of a slender, cylindric, basal portion, and a tuberous apical one, the former functioning as a nutritive, the latter as a storage root, which is also able to produce root-shoots. The anatomical structure of both regions is discussed, and it is interesting to notice that in the tuberous part the mestome strands are not arranged in a circle; that the inner mestome strands are collateral; and that, at least in some portions of the tuber, no endodermis is differentiated.-THEO. HOLM. Secretory organs of Menispermaceae.-According to MAHEN,'9 these consist of ducts with tannin, ducts with caoutchouc, and secretary cells. Ducts with tannin occur in the cortex and pith of the stem, in the primary cortex of the root, in the parenchyma of the petiole, and in the midrib of the leaf. They are tubes of considerable length, and very often difficult to detect without tests for tannin; and are characteristic of certain species of Anamirta, Cocculus, Cissampelos, Burasaia, Calicocarpum, etc. Ducts with caoutchouc are known only in Tinomiscium, being found in all the vegetative organs as follows: in the stem, around the sclerenchymatic arches of the pericycle and in the pith; in the leaf, in midrib and petiole around the mestome strands. They are tubular and very thin walled. The latex is white and granulose, readily soluble in chloroform, but only partly so in absolute alcohol and ether. The secretary cells, observed only in Abuta rufescens, and containing an essence, abound in the stem near the sclerenchymatic pericyle on its outer and inner face.-THEo. HOLM. A Linnean herbarium.-Although the herbarium of LINNAEUS went to London after his death, several other collections made by him and his pupils remained in Sweden, but have not been accessible until recently. In fact, it was not known i8 LINDINGER, LEONHARD, Ueber den morphologischen Wert der an Wurzeln enstehenden Knollen einiger Dioscorea-Arten. Beih. Bot. Centralbl. 2 I:3 I. I907. 19 MAHEN, JACQUES, Sur les organes secr6teurs des Menispermac6es. Bull. Soc. Bot. France 53:65I. i906.