. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Flo. 31. COLLETOTRIIHIIM LUMFICUM. Longitudinal Section of a Pustule, showing Conidiophores, Conidia and Hairs. hyaline or slightly coloured. To this family belongs the genus Ascliiisoniii, two species of which are parasites on the white fly in Florida. The members of these two faniilies probably represent stages in the life-history of different members of the Sphaeri- ales and Hypocreales, respectively, in the Ascomycetes. (See Aijricultimxl Xeirs, Vol. , p. 12fi.) The melanconiales. In this cohort, the conidia
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Flo. 31. COLLETOTRIIHIIM LUMFICUM. Longitudinal Section of a Pustule, showing Conidiophores, Conidia and Hairs. hyaline or slightly coloured. To this family belongs the genus Ascliiisoniii, two species of which are parasites on the white fly in Florida. The members of these two faniilies probably represent stages in the life-history of different members of the Sphaeri- ales and Hypocreales, respectively, in the Ascomycetes. (See Aijricultimxl Xeirs, Vol. , p. 12fi.) The melanconiales. In this cohort, the conidia are pro- duced on a more or less developed cushion or stroma, beneath the surface of the substratum. These cushions finally break through to the surface, in most cases, and form superficial pustules of spores, often coloured in the mass, as in the genus Colletotrichuiii, where they are frequently pink or yellow. The stroma is generally black, and this gives the fructifications a black appearance when young. In the case of CoUetotri- r/iuiii falcatuiii -they remain black. In other cases, the spores are in a tendril and are dark brown, or black in the mass, as in the genus Melanconiiim The cohort contains only one family—the Melanconiaceae, but this embraces several important economic genera. It contains, for instance, the an- thracnose fungi of the genera Colletotrichum and Gloeosporiuni. Collctotrichumi/ossypii causes of cotton, V. ^ ^/ witches'brooai of cacao ™ / (Fig. 31), and in addi- tion several other spe- cies occur on cacao- pods. (See West Indian J]nlleiin,Yo\.X,l).25\.) C. falcatvm causes red rot of sugar-cane, and Gloeosporium m. usa- riim, anthracnose of bananas. The melanco- nium stage of 7'richo- sphai'i -ia sa ccha i i—the Fii! 30. Diplodia cACioicoLA. rind disease fungus of Longitudinal Section of a Pycnidium sugar-cane, was also at showing Conidiophores, Conidia and one time thought to be. Please note th
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