A text-book of mycology and plant pathology . e saprophytes, useful in the destruction of dead plantparts. Many are parasites and produce dangerous diseases in culti-vated plants. A. Conidia in pycnidia, or chamber-like hollows. I. SPH/EROPSI-DALES. B. Conidia in conidial layer formed ultimately wholly free. C. Conidia on conidiophores. Single or in coremia. III. HYPHO-MYCETALES. I. SPH^ROPSIDALES.—The conidia are formed in receptacles are closed or open l)y a pore, or by a slit suggesting FUNGI IMiERFECTI (dEUTEROMYCETES) 261 groups of ASCOMYCETALES. Four famili
A text-book of mycology and plant pathology . e saprophytes, useful in the destruction of dead plantparts. Many are parasites and produce dangerous diseases in culti-vated plants. A. Conidia in pycnidia, or chamber-like hollows. I. SPH/EROPSI-DALES. B. Conidia in conidial layer formed ultimately wholly free. C. Conidia on conidiophores. Single or in coremia. III. HYPHO-MYCETALES. I. SPH^ROPSIDALES.—The conidia are formed in receptacles are closed or open l)y a pore, or by a slit suggesting FUNGI IMiERFECTI (dEUTEROMYCETES) 261 groups of ASCOMYCETALES. Four families arc included in thisorder, and these families include a considerable number of importantgenera of fungi, which specifically are the cause of important j)lantdiseases. Phyllosticta is a genus, the species of which are confined toleaves, and they produce characteristic leaf spots on a great variety ofplants. The specific name of the fungus is usually derived from thatof the host plant attacked, as for example, Phyllosticta catalpcB, which. Fig. 103.—Six j3en Davis apples showing apple blotch {Phylloslica solilaria).{After Scott, W. M„ and Rarer, J. B., Bull. 144, U. S. Bureau of Plant^Industry,March 6, 1909.) grows on the leaves of the catalpa. The group has been monographedsystematically by J. B. Ellis. The spores are small, egg-shaped orelongated, unseptate and in color pale green, or hyaline, produced inpycnidia. The most important species of this genus are Phyllostictaampelopsidis on the Virginia creeper {Ampelopsis); catalpa on catalpaleaves; labrusccB on the leaves of the grape; pavice on horse chest-nut leaves (Fig. 102); Phyllosticta solitaria E. and E. (Figs. 103 and104) is the cause of apple blotch, and vtolce on violets. The conidio- 262 MYCOL(3GY spores in Phoma are colorless and unicellular. The pycnidia areblack with a terminal pore and depressed in the tissues of the genus is arbitrarily limited to those species in which the sporesare less than 15
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