The natural history of plants, their forms, growth, reproduction, and distribution;

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Identifier: naturalhistoryof02kern (find matches)
Title: The natural history of plants, their forms, growth, reproduction, and distribution;
Year: 1902 (1900s)
Authors: Kerner von Marilaun, Anton, 1831-1898 Oliver, Francis Wall, 1864- Macdonald, Mary Frances Ewart Busk, Marian Balfour, Lady
Subjects: Botany
Publisher: London, Blackie
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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ese arethe calcareous incrustations of the Corallinas, Melohesias, Lithothamnions, &c., men-tioned above. They occur in both the secondary and tertiary rocks. The Leithalimestone, largely used for building purposes in Vienna, comes from extensive nulli-pore banks in the Leitha Mountains, south-west of Vienna on the Hungarianfrontier, and, just as in Paris many of the finest buildings are constructed of theconsolidated calcareous remains of Foraminiferse, so in Vienna are the incrustationsof certain red sea-weeds put to this purpose. 668 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. Class v.—FUNGI. Parasitic or saprophytic plants destitute of chlorophyll and for the most partpossessing a mycelium. Sexual reproduction known and generally admitted inthe Phycomycetes only. Asexual reproduction by means of spores and conidia. Sub-class I.—Phycomycetes. Mycelium for most part unicellular, tubular, and branched,both by conjugation of equivalent cells and by egg-cells. Sexual reproductic
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Fig. 379.—Chytridiaceae and Ancylistaceoe. , *, s LaQenidium Rahenhorstii, parasitic upon Spirogyra. *, « Polyphagus Euglence. « rihizidioinyceis apophysatics, parasitic on an oogonium of Saprolegnia. Alliance XIV.—Oomycetes Families: PeronosporecB, Saprolegniaceoe, Chytridiacece, Ancylistacece,Entomophihorece. Mycelium often very slightly developed; asexual reproduction by means ofswarm-spores; sexual reproduction by egg-cells. On the whole in this group we aredealing with Fungi which very nearly resemble the Algoe of the Alliance SiphoneaB(e.g. Vaucheria) both as regards the structure of their mycelium and mode of repro-duction. A loss of sexuality is to be noted in many members of this group. THALLOPHYTA. 669 Peronosporece.—Are mostly parasitic upon Flowering Plants, and the cause ofmany destructive diseases. They establish themselves by means of a branching,tubular, non-septate mycelium which penetrates the intercellular system of the host-plant (cf. p. 56). They propagate

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