THE PYRENOID OF ANTHOCEROS 
93 
Summary 
1. The pyrenoid of Anthoceros laevis is not homogeneous at any 
time but is made up of from 25 to 300 closely aggregated disc- or 
spindle-shaped bodies, which I have called pyrenoid bodies. These 
pyrenoid bodies give positive results with microchemical tests for 
protein. 
2. During photosynthesis the outer bodies of the pyrenoid are 
converted directly into starch masses. These rudimentary starch 
grains increase in size to form the mature starch grains. 
3. New pyrenoid bodies are formed apparently by the fission of 
preexisting bodies. 
4. In the sporogenous tissue of the sporophyte, starch is formed 
in large amounts without the agency of visible pyrenoids. 
5. Pyrenoids are not visible in the embryonic assimilative tissue 
of the sporophyte, but, as these cells are pushed away from the 
embryonic region, scattered bodies appear which later become closely 
aggregated to form the pyrenoid. 
LITERATURE CITED. 
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1906. 
4. Studies on some Javanese Anthocerotaceae. Ann. Bot. 21: 467-486. I907« 
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6. Denniston, R. H. The growth and organization of the starch grain. Trans. 
Wis. Acad. Sci., Arts, and Letters 15: 665-708. 1907. 
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8. Guiiliermond, A. Recherches cytologiques sur la mode de formation de I'amidon 
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310-428. 1912. 
9. Leitgeb, H, Untersuchungen iiber die Lebermoose. V. Die Anthoceroteen. 
1879. 
10. Lewitsky, G. Die Chloroplastenanlagen in lebenden und fixierten Zellen von 
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