. Elementary botany. Botany. Fig. 194. A mucor (Rhizopus nigricans); at left nearly mature sporangium with columella showing witliin; in the middle is ruptured sporangium with some of the gonidia clinging to the colu- mella ; at riglit two ruptured sporangia with everted columella. capable of growinir and forming the mycelium again. They are sometimes called chlaniydosporvs. 890a. The Mucorinete according to their manner of zygospore formation are of two kinds: ist, the homoihalVic (moncecious), in which all of the colo- nies or thalli developed from different spores are the same, and both gam
. Elementary botany. Botany. Fig. 194. A mucor (Rhizopus nigricans); at left nearly mature sporangium with columella showing witliin; in the middle is ruptured sporangium with some of the gonidia clinging to the colu- mella ; at riglit two ruptured sporangia with everted columella. capable of growinir and forming the mycelium again. They are sometimes called chlaniydosporvs. 890a. The Mucorinete according to their manner of zygospore formation are of two kinds: ist, the homoihalVic (moncecious), in which all of the colo- nies or thalli developed from different spores are the same, and both gametes may be developed from the mycelium from a single spore, as in Sporodinia grandis, a mould common on old mushrooms; 2d, the helerothallic (dioe- cious), in which certain plants are of a male nature and small in compari- son with those of perhaps a female nature which are larger or more vigor- ous. W'hen grown separately each of these two kinds ot thalli, or colonies of mycelium, ]"jroduce their own kind but only sporangia. I! the two kinds arc brought together, however, branches from one conjugate with branches from the other and zygospores are produced, as in Rhizopus nigricans, the common bread or fruit mould. This is one reason why we rarely find this fungus forming zygospores. (See Blakeslee, Reproduction in the Mucorineffi, Proc. Am. Acad. Arts and Sci., 40, 205-319, pi. 1-4, 1904.). 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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