Elementary botany . i; examples: mucor, saprolegnia,peronospora, etc. * Class Myxomycetes, or Myoetozoa. — To this class belong the slimemolds, low organisms consisting of masses of naked protoplasm whichflows among decaying leaves and in decaying wood, coming to the surfaceto fruit. The fruit in many cases resembles miniature puff-balls, and theseplants were formerly classed with the puff-balls. The spores germinate by 213 214 MORPHOLOGY. these views, might be presented here to show the general relationships ofthe fungi studied, with the addition of a few more in orders not representedabove.
Elementary botany . i; examples: mucor, saprolegnia,peronospora, etc. * Class Myxomycetes, or Myoetozoa. — To this class belong the slimemolds, low organisms consisting of masses of naked protoplasm whichflows among decaying leaves and in decaying wood, coming to the surfaceto fruit. The fruit in many cases resembles miniature puff-balls, and theseplants were formerly classed with the puff-balls. The spores germinate by 213 214 MORPHOLOGY. these views, might be presented here to show the general relationships ofthe fungi studied, with the addition of a few more in orders not representedabove. It should be borne in mind that the author in presenting this viewof classification does not necessarily commit himself to it. It is basedon that presented in Engler & Prantls Pflanzenfamilien. There are threeclasses. I. Class Phycomycetes (Alga-like Fungi). 1. SUBCLASS These are the egg-spore fungi. They include the water mold(Saprolegnia), the downy mildew of the grape (Plasmopara), the potato. Fig. A, Harpochytrium hedenii, parasitic on spirogyra threads; a, sickle-form plant; b, the sporangium part with escaping zoospores; c, old plant pro-liferating by forming new sporangium in the old empty one; d, zoospore; 0, twoyoung plants just beginning to grow. B, Rhizophidium globosum parasitic onspirogyra. Globose sporangium with delicate threads inside of the host, zoosporesescaping from one. C, Olpidium pendulum, parasitic in spirogyra cell. Ellip-tical sporangium with slender exit tube through which zoospores are , Lagenidium rabenhorstii parasitic in spirogyra cell. Two slender sporangiawith exit tubes through which protoplasm escapes forming a rounded mass at theend of tube, this protoplasm forming biciliate zoospores. forming swarm spores which unite to form a small plasmodium, which inturn grows to form a large plasmodium or protoplasmic mass. It is doubt-ful if they are any more plant than animal organisms. Examples: Trichia,Arcyria
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
