Text-book of structural and physiological botany . hce or subhymenial layer;and of the true hymenial layer^ composed of parallel hyphaeox paraphyses and of the asci. These latter usually contain special Morphology and Classification. 289 eight spores formed simultaneously. When the same thallusbears both apothecia and spermogonia, the Lichen is saidto be monoecious; when these organs are found on differentindividuals, it is dioecious. No true process of impregna-tion has yet been observed. Lichens possess a peculiar double nature. Theirgonidia contain chlorophyll, and are algoid bodies; andthe
Text-book of structural and physiological botany . hce or subhymenial layer;and of the true hymenial layer^ composed of parallel hyphaeox paraphyses and of the asci. These latter usually contain special Morphology and Classification. 289 eight spores formed simultaneously. When the same thallusbears both apothecia and spermogonia, the Lichen is saidto be monoecious; when these organs are found on differentindividuals, it is dioecious. No true process of impregna-tion has yet been observed. Lichens possess a peculiar double nature. Theirgonidia contain chlorophyll, and are algoid bodies; andtheir presence is the only certain distinction betweenLichens and Fungi; the Ascomycetes among the latter hav-ing an especially close relationship to the Lichens throughtheir apothecia. In only a few cases have the gonidia been,detached from the thallus and made to develope inde-pendently, by the formation chiefly of swarmspores. Fromthis fact the theory has originated that Lichens are ascomy-cetous Fungi which are parasitic on particular Algae, the.
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