Introduction to the study of fungi : their organography, classification, and distribution for the use of collectors . Dothideoideae and Ehytismoideae the species arecompound, and in Dothideoideae the carbonaceous or coriaceousstroma is seldom broadly effused^ and the pseudo-peritheciadehisce when mature by an apical pore. The largest genus isPliyllachora, in which the stroma is either shield-like or shortlyeffused and superficial, and the species are most commonlyfound growing on leaves, and not rarely whilst they are stillliving, but sometimes wlien dead. The sporidia are uncolouredand unicel
Introduction to the study of fungi : their organography, classification, and distribution for the use of collectors . Dothideoideae and Ehytismoideae the species arecompound, and in Dothideoideae the carbonaceous or coriaceousstroma is seldom broadly effused^ and the pseudo-peritheciadehisce when mature by an apical pore. The largest genus isPliyllachora, in which the stroma is either shield-like or shortlyeffused and superficial, and the species are most commonlyfound growing on leaves, and not rarely whilst they are stillliving, but sometimes wlien dead. The sporidia are uncolouredand unicellular in typical forms, but in some of the subgenerathey are coloured and continuous, or uniseptate, and in othersuniseptate and hyaline, but rarely triseptate and hyaline orcoloured. In Dotliidca the stroma is erumpent and pulvinate,the sporidia again are variable, according to the species occur, in most cases, on branches, and rarelyon leaves, in which feature it differs from PhyllacJiora. In Fig. 96.—Poronia imnctata withsection (enlarged). Gard. Cliron. 2o8 INTRODUCTION TO THE STUDY OF FUNGI. Euryachwa the stroma is broadly effused and punctulate, whilstin Homostcfjia the stroma is plane or hemispherical, and the species are parasitic uponLichens. In lihoijographusthe stroma is elongated andlinear, suggesting a resem-blance to some Hysteriaceousperithecia. Species of Phyl-laclwra are common on cori-aceous leaves in tropical coun-tries, and are sometimesdiilicult to distinguish atfirst from some of the Rhy-tismoideae. In common withthe latter the stroma is oftenpresent for some time beforethe fructification is developed,hence they are often met within a sterile condition. The subfamily Rhytis-moideae is included by someauthors with the Biscomyceteae, on account of the mode ofdehiscence, which is usually by gaping fissures, so that thehymenium is more or less exposed; but this dehiscence doesnot take place until the sporidia arefully mature, and sometimes not
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