. Botany of the living plant. Botany. 404 BOTANY OF THE LIVING PLANT Many of these grow on decaying humus, and Hke the Common Mush- room are saprophytes. Others are parasites, hke the large shelf- fungi {Polyponcs), which grow out from the trunks of trees, and are the cause of the perishing of the heart-wood in hollow timber ; or like the Honey-Agaric {Armillaria mellea), which kills forest trees by attacking their soft and nutritious cambium (Fig. 340). But. Fig. 339. Harveyella mirabilis, growing as a colourless parasite on the thallus of Rhodomela, one of the Red Algae. Longitudinal section
. Botany of the living plant. Botany. 404 BOTANY OF THE LIVING PLANT Many of these grow on decaying humus, and Hke the Common Mush- room are saprophytes. Others are parasites, hke the large shelf- fungi {Polyponcs), which grow out from the trunks of trees, and are the cause of the perishing of the heart-wood in hollow timber ; or like the Honey-Agaric {Armillaria mellea), which kills forest trees by attacking their soft and nutritious cambium (Fig. 340). But. Fig. 339. Harveyella mirabilis, growing as a colourless parasite on the thallus of Rhodomela, one of the Red Algae. Longitudinal section of Rlwdomela bearing the parasite, with a mature cystocarp, the fertile filaments of which are black. The cells of the host with food-material are dotted ; those which are exhausted are left blank. (After Sturch.) apart from these there are multitudinous smaller Fungi, such as the parasitic Mildews and saprophytic Moulds, while the unicellular ; Yeasts show the simplest structure of them all. However compHcated ! and various their structure may be, it is based upon the simple or 1 branched filament, or hypha. The w^hole system of such hyphae is ; called a mycelium. Such filaments may grow singly, as in the Moulds j and Mildews, or they may be massed together so as to form the ; complex bodies of the larger Fungi. When closely appressed the septate filaments may seem to form a definite tissue ; but it is in V. I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
