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Although the prirnordia of all types of leaves in IIippliris show no distinguishing characteristics until they are 50 microns long, their further development is strongly influenced by their environ~nent. A t maturity they can, for convenience, be thought of as belonging to one of five types, or some intermediate of these Types. The five types of leaves are: rhizome, juve~lile aquatic, adult aquatic, juvenile aerial, and adult aerial. Field and experimental studies indicate that the leaf form in Hippziris is influenced by light and the water relations between the plant and its environment. There is great uniformity of foliar morphology on plants from stocl;s of diverse origin when grown under ~~n i f o r m condit~ons, and there is wide diversity of foliar n~orphology on plants of the same stock material when grown under different environments in the laboratory. TIILIS the taxono~nic subdivision of genus Hippziris into species, varieties, and forms using leaf morphology as the main criterion appears questionable. IIbIanuscript
Although the prirnordia of all types of leaves in IIippliris show no distinguishing characteristics until they are 50 microns long, their further development is strongly influenced by their environ~nent. A t maturity they can, for convenience, be thought of as belonging to one of five types, or some intermediate of these Types. The five types of leaves are: rhizome, juve~lile aquatic, adult aquatic, juvenile aerial, and adult aerial. Field and experimental studies indicate that the leaf form in Hippziris is influenced by light and the water relations between the plant and its environment. There is great uniformity of foliar morphology on plants from stocl;s of diverse origin when grown under ~~n i f o r m condit~ons, and there is wide diversity of foliar n~orphology on plants of the same stock material when grown under different environments in the laboratory. TIILIS the taxono~nic subdivision of genus Hippziris into species, varieties, and forms using leaf morphology as the main criterion appears questionable. IIbIanuscript
It has been found that the near-wilt disease of peas, caused by Fusarium oxysporum f. pisi race 2 (Linford) Snyder & Hansen, is now present in the canning districts of Ontario. Conclusions as to the identity of the fungus associated with the wilting condition in field plants have been based upon a study of the differential disease-response of the pea varieties Little Marvel, W.R. Perfection and New Era, the histology of infection in the susceptible pea host, and the characteristics of the fungus when in culture. The capacity of the fungus to establish a symptomless host-parasite relationship with certain legumes not normally regarded as susceptible to the near-wilt pathogen has been demonstrated. The possible role of such "non-susceptible hosts" in perpetuating the fungus between pea crops has been discussed.
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