. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 105 Sporangia globular; columella not constricted 8. Circinella. Sporangia pear-shaped; colu- mella constricted 9. Piiella. Mycelium metallic; suspensors spiny 10. Phycomyces. Sporangia of two kinds, the primary many-spored; the secondary few- spored Subfamily III. Thamnidiese. PUobolus crystallinus (Wigg.) Tode, a form with beautiful crystalline sporangia on yellowish, evanescent sporangiophores has been frequently noted as injuring or smudging chrysanthemum, rose and other leaves 121-122 y^y j^
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 105 Sporangia globular; columella not constricted 8. Circinella. Sporangia pear-shaped; colu- mella constricted 9. Piiella. Mycelium metallic; suspensors spiny 10. Phycomyces. Sporangia of two kinds, the primary many-spored; the secondary few- spored Subfamily III. Thamnidiese. PUobolus crystallinus (Wigg.) Tode, a form with beautiful crystalline sporangia on yellowish, evanescent sporangiophores has been frequently noted as injuring or smudging chrysanthemum, rose and other leaves 121-122 y^y j^g profuse discharge of spo- rangia. It is not, however, a parasite. Of the other genera the only ones of interest regarding plant disease are Rhizopus and Mucor. The others are saprophytes found on a great variety of substances, manure, fungi, and many other kinds of organic matter. Rhizopus Ehrenberg (p. 104) The sporangium wall is not cutinized, and falls away. The sporangia are all of one kind and with columellas. The sporan- giophore is never dichoto- mous; zygotes are found in the mycelium. The suspensor is without outgrowths. Twelve or fifteen species, chiefly sap- rophytes. R. nigricans Ehr. Aerial mycelium at maturity choco- ^^^ Dia^am showing late-colored; rhizoids numer- mycelium andsporophores. After Coul- , . ter, Barnes and Cowles. ous; sporangiophores fascicu- late, erect, aseptate; sporangia globose, blackish-olive, granular; columella hemispheric; spores gray to brown, subglobose or irregu- lar, 11-14 fi; zygospore 150-200 /*, epispore with rounded warts, black. This is the cause of soft rot of stored vegetables, particu- larly of sweet potatoes, 12'also of Irish potatoes,^^^apples and pears; it causes death of squash blossoms ^^^ and is destructive to barley. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
