. The fungi which cause plant disease . Plant diseases; Fungi. 168 THE FUNGI WHICH CAUSE PLANT DISEASE three to six on the ends of hyaline branches, Fig. 119. These conidia fall apart as they age. The hyaline conidia preponderate in early disease, giving the surface of the root a mildewed appearance; the dark conidia pre- ponderate later, covering the root with a black coating. Finally, after the host is dead, the ascocarps appear. The delicate hyaline myce- lium wanders through the affected root disorganizing its tissue. The superficial myce- lium is Ughtly tinted. Perithecia 80-100 n; asci o
. The fungi which cause plant disease . Plant diseases; Fungi. 168 THE FUNGI WHICH CAUSE PLANT DISEASE three to six on the ends of hyaline branches, Fig. 119. These conidia fall apart as they age. The hyaline conidia preponderate in early disease, giving the surface of the root a mildewed appearance; the dark conidia pre- ponderate later, covering the root with a black coating. Finally, after the host is dead, the ascocarps appear. The delicate hyaline myce- lium wanders through the affected root disorganizing its tissue. The superficial myce- lium is Ughtly tinted. Perithecia 80-100 n; asci ovate, 8-spored; spores len- ticular, vacuolate, 1-celled, chocolate-colored, 8-12 x 4-5 n; chlamydospores in chains, at maturity separa- ting, . short-cylindric, about 5-8 X 12 j«; the entire group 25-65 ft long; conidia hyaline about 10-20 X 4-5 n. In Europe and Eastern North America on Aralia quinquefolia. Begonia rubra, Begonia sp., Catalpa speciosa, Cyclamen sp., Gossypium herbaceum, Linaria canadensis, Lupinus angustifolius, L. albus, L. luteus, L. thermis. Nasturtium armoracea, Nemophila auriculata, Nico- tiana tabacum, N. rustica, Onobrychis cristagalli, Oxalis stricta, Phaseolus VTilgaris, P. multiflorus, Pisum sativum, Senecio elegans, Trifolium repens, Trigonella ccerulea, Vigna sinensis and Viola odorata. Rostrella coffeae Zimm. is described as the cause of canker of coffee in Java.'^^ Aspergillus Micheli (p. 167) The ascocarps are small, spherical, indehiscent, smooth bodies which at maturity are entirely filled with 8-spored asci; spores. Fig. 119.—Thielavia basicola, showing two conidial forms and ascus and ascospores. After Van Hook and 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 Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
