. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 209 yellowish, cylindrical, slightly curved, discharged in twisted threads as in Cytospora, This fungus, originally described as Diaporthe parasitica, is a serious parasite on the chestnut. The mycelium grows through the inner bark in all directions from the initial wound at which in- fection occurred, eventually girdling the part. The wood is also affected. The perithecia appear in abundance upon or in cracks of the baxk, extruding their spores in greenish to yellow threads. Hypocrea Fries (p. 1
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 209 yellowish, cylindrical, slightly curved, discharged in twisted threads as in Cytospora, This fungus, originally described as Diaporthe parasitica, is a serious parasite on the chestnut. The mycelium grows through the inner bark in all directions from the initial wound at which in- fection occurred, eventually girdling the part. The wood is also affected. The perithecia appear in abundance upon or in cracks of the baxk, extruding their spores in greenish to yellow threads. Hypocrea Fries (p. 199) Stroma subglobose to patellate, fleshy or subfleshy; perithecia entirely immersed, subglobose to ovate, the necks slightly pro- truding; asci cylindric, originally 8-spored, spores breaking each into two so that the asci at maturity contain sixteen hyaline spores. About one hundred ten species. H. ceretriformis Berk, occurs on the bamboo in Tonkin; H. sacchari on sugar cane. Balansia Spegazzini (p. 199)'^^ Sclerotium composite, formed of the affected parts of the host embedded in a well developed mass of fungous tissue; stroma arising from the sclerotium, stipi- tate and capitate or sessile, pul- vinate, obovate, discoid, or sepa- rated from the sclerotium as soon as the latter is mature, sur- face slightly papillate from the projecting ostiola of the im- mersed scattered perithecia; asci 8-spored; paraphyses none. Co- nidia, when known, an Ephelis and preceding the stroma. B. hjrpoxylon (Pk.) Atk. oc- curs on various grasses, chiefly in the southern United States, fig. i50, B. claviceps Speg. infests Setaria and Pennisetum in tropical lands. The remaining species, chiefly of warm regions, are mostly grass B. hypoxylon, section pseudosclerotium and one stroma showing perithecia, stem, leaf ele- ments and an ascus. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
