. The fungal diseases of the common larch . Larches. HEART-ROT 103 have occasionally been found. Each spore is attached to the basidium by a very thin extension of the latter called a sterigma (fig. 41, b, st.), and when ripe the spore which, develops at its extremity is cut off from the sterigma by a transverse septum. The mature spores are hyahne, measui-e 5-5-7 X 4-5-5/x, and have a slight projection at one side, where they are attached to the sterigmata. The. Fig. 42.—Diagram showing tlic necessity for tlie pores to be vertical. Ill A, in which tlie orientation is correct, all the spores e
. The fungal diseases of the common larch . Larches. HEART-ROT 103 have occasionally been found. Each spore is attached to the basidium by a very thin extension of the latter called a sterigma (fig. 41, b, st.), and when ripe the spore which, develops at its extremity is cut off from the sterigma by a transverse septum. The mature spores are hyahne, measui-e 5-5-7 X 4-5-5/x, and have a slight projection at one side, where they are attached to the sterigmata. The. Fig. 42.—Diagram showing tlic necessity for tlie pores to be vertical. Ill A, in which tlie orientation is correct, all the spores escape. In b, which is tilted, only a small proportion of the spores escape from the pores and the rest stick to the sides. For the sake of clearness the pores are shown as much wider in proportion to their length than is the case in Fomus annosus. For correct proportions the pores should be eight times as long as in the diagram. j?he loss of spores through tilting would then be much greater than that shown in the diagram. paraphyses are similar to the basidia in shape, but remain sterile, and servo to keep the basidia at appropriate distances. The spores, hke those of most Hymenomycetes, arc slightly sticky, so that if they come in contact, during their fall, with the sides of the pores, they adhere and faU to escape. To prevent this it is necessary for the pores to be exactly vertical, and the fungus, by some means not as yet understood, has the power of making them grow in the. 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 Hiley, W. E. (Wilfrid Edward). Oxford : Clarendon Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheroxfor, bookyear1919
