. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 125 these prized as table delicacies, and the Laboulbeniales, an order rich in species which are all parasitic upon insects. Protodiscales (p. 123) The 4-8 to many-spored asci form a flat palisade-like hymenium which arises directly from the mycelium; paraphyses none; spores, one-celled, elliptical or round. Key to Families of Protodiscales Parasitic 1. Exoascaceas, p. 125. Saprophytic 2. Ascocorticiaces. Of these families the second contains only one genus and two species found in bark. The firs
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 125 these prized as table delicacies, and the Laboulbeniales, an order rich in species which are all parasitic upon insects. Protodiscales (p. 123) The 4-8 to many-spored asci form a flat palisade-like hymenium which arises directly from the mycelium; paraphyses none; spores, one-celled, elliptical or round. Key to Families of Protodiscales Parasitic 1. Exoascaceas, p. 125. Saprophytic 2. Ascocorticiaces. Of these families the second contains only one genus and two species found in bark. The first family is aggressively parasitic. —, 292. 327 Exoascacese This is the most simple of the parasitic Ascomycetes, definitely recognizable as such, and is comparable with the Exobasidiales among the Basidiomycetes. All the species are parasitic and many of them very injurious. The mycelium, which can be distinguished from that of other fungi by its cells of very irregular size and shape, wan- ders between the host cells (intra- cellular in one species), or is some- times limited to the region just f,(j. 85.—Exoascus showing myce- below the cuticle. The asci develop Hum and asci. After Atkinson. in a palisade form on a mycelial network under the epidermis, or the cuticle, or on the ends of hyphse arising from below the epi- dermal cells. They are exposed by the rupture of the cuticle or epidermis and contain four to eight hyaline, oval, one-celled spores. These by budding, while still in the ascus, may pro- duce numerous secondary spores, conidia, which give the im- pression of a many-spored ascus. The ascospores also bud freely in nutritive solutions. The primary-ascus-nucleus arises from. 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
