. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . Flu. 97.—Ihddiiiia, globose stroma andsectiou. Oard. Chron. authors with the Discomycdeadehiscence, 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 untildisintegration has commenced. Inexternal appearance the species arcvery similar to Phyllachora and Eury-acliora, and yet in texture of thestroma, and often in the fructification,appear to be more close
. Introduction to the study of fungi, their organography, classification, and distribution for the use of collectors . Flu. 97.—Ihddiiiia, globose stroma andsectiou. Oard. Chron. authors with the Discomycdeadehiscence, 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 untildisintegration has commenced. Inexternal appearance the species arcvery similar to Phyllachora and Eury-acliora, and yet in texture of thestroma, and often in the fructification,appear to be more closely allied tothe Dothidcaceae than to any familyof the Discomyccteae. Practically, theonly genus is IlhyUsma, for the sporidiaof so many described species areunknown that no proposals have beenpossible to divide them into genera based upon the fructifi-cation. Such a species as Rhytisma accrinum, which is common. Fig. 98.—Globose stroma ofJfl/2}oxi/lo)i, with asci andsi:)oridia. CAPSULAR FUNGI—PYRENOMYCETES 209 on the living leaves of maple, belongs to the Sphaeropsideaein that condition, but after resting on the ground during thewinter, asci and sporidia are developed. The third subfamily, Stigmatoideae, includes genera invi^hich the perithecia are distinct from each other, and thereforedivergent from the family type, and approaching the Stiper-ficialcs of the old genus Sphaeria. Hypospila has, however, afeature which associates it with Dothideoideae, in the definitestroma in which the perithecia are immersed; and also, onthis account, Trabutia shows a relationship with the genera Stigmatea and Parodidla the perithecia aresuperficial and globose, often found growing on living leaves ;but in Stigmatea there is a very minute ostiolum, and in Paro-didla none at all; hence the latter suggests Perisporiaceae. In the subfamily Melogramiiicae the perithecia are eitherformed from t
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