. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. WHERRY, EDGAR T.: Fern Field Notes, 1934. American Fern Journal, 2^:97, (1934). - Native Orchids, (7) The Spiral Orchids. The American Orchid Society Bulletin, J:25, (1934). Native Orchids, (8) Our Smaller Broad- leaved Species. The American Orchid Society Bulletin, J:47, (1934). â Native Orchids, (9) One-leaf and Leafless Orchids. The American Orchid Society Bulletin, i:68, (1934). â Our Native Phloxes and Their Horticultural Derivatives. The National Horticultural Magazine, 2^:209, (1935). The Polemoniaceae of Pennsylvan
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. WHERRY, EDGAR T.: Fern Field Notes, 1934. American Fern Journal, 2^:97, (1934). - Native Orchids, (7) The Spiral Orchids. The American Orchid Society Bulletin, J:25, (1934). Native Orchids, (8) Our Smaller Broad- leaved Species. The American Orchid Society Bulletin, J:47, (1934). â Native Orchids, (9) One-leaf and Leafless Orchids. The American Orchid Society Bulletin, i:68, (1934). â Our Native Phloxes and Their Horticultural Derivatives. The National Horticultural Magazine, 2^:209, (1935). The Polemoniaceae of Pennsylvania. Pro- ceedings of the Pennsylvania Academy of Science, 9:150, (1935). - Supplementary Notes on the Eastern Phloxes Bartonia, No. 7d:38, (1934). _- A Variety of Phlox ovata from the Alabama Mountains. Bartonia, No. 2d:37, (1934). ZIRKLE CONWAY: The Inheritance of Acquired Characters and the Provisional Hypothesis of Pangenesis. The American Natural- ist, ($9:417, (1935). ^*1 ^â f 4 ^m^ 4 â¢â¢â¢'.p^ ^ ^4^ ^. THE FIXING AND STAINING OF LIRIODENDRON TULIPIFERA ROOT TIPS AND THEIR MYCORRHIZAL FUNGUS i IsADORE Cohen, Harrison Fellow, Department of Botany, University of Pennsylvania, and K. D. Doak, U. S. De- partment of Agriculture, Bureau of Plant Industry, Office of Forest Pathology Abstract.âRoot tips of Liriodendron Tulipifera forming with a fungus of the Mycelium Radicis group an endotrophic mycorrhiza, were subjected to several different fixations in which the action of cationic chromium and anionic chromium were compared. Anionic chromium in the form of chromic acid was combined with several substituted benzene compounds while cationic chromium in the form of chromic sulfate (Cr^CSOOa-lS H2O) in 4% formaldehyde (HCHO) was used with the same ring compounds. In addition, several fixatives not containing chromium were tested. Five percent chromic sulfate (Cr2(S04)3-15 H2O) in 4% formalde- hyde (HCHO) or in 1% osmic acid with saturated aqueous salicylic and /or picric
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