. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 522 AMERICAN JOURNAL OF BOTANY [Vol. 25, Lkwis. I. F. 1910. Periodicity in Dlclyola at Naples liot. Caz. 50: 59-64. LisTKu. A. 188S. Xotos on tho iilasmodium of Bad- Ikuu'ki and lire fi hi id. Annals Jiof. 2: 1-24. 1925. Monojiiaph of tho niycolozoa. 3rd. odilion, rovis(-d by G. Oxford University Press. LoKH. J. 1904. The control of heliotropic reactions in fresh water crustaceans by cheniicals. (^specially COa. Univ. (\ilifornia Puhl. Physiol, 2(1): 1-3.
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 522 AMERICAN JOURNAL OF BOTANY [Vol. 25, Lkwis. I. F. 1910. Periodicity in Dlclyola at Naples liot. Caz. 50: 59-64. LisTKu. A. 188S. Xotos on tho iilasmodium of Bad- Ikuu'ki and lire fi hi id. Annals Jiof. 2: 1-24. 1925. Monojiiaph of tho niycolozoa. 3rd. odilion, rovis(-d by G. Oxford University Press. LoKH. J. 1904. The control of heliotropic reactions in fresh water crustaceans by cheniicals. (^specially COa. Univ. (\ilifornia Puhl. Physiol, 2(1): 1-3. M.\sT. S. (). 1911. Lis. Le liotaniste 24: 107-140. Stahl, K. 1884. Zur liiologie der Mvxonivccten. Zeitschr. Bot. 42: 146-155, 162-175, 187-191. Stobhk, H. 1908. Phototroi)ieerscheinungen bei Fulgi- den und anderen StofTen. Licbig's Annalen der Cheniie, Bd. 359: 1-48. Tahaka, M. 1909. On tho periodical liberation of tho oospheres in Sargassmn. Bot. Mag. Tokyo 23: 151- 153. 1913. Oogonium lil^eration and the ombryogony of some fucaceous algae. Jour. Coll. Sci. Univ. Tokyo 32 (9): 1-13. Williams, J. L. 1898. Reproduction in Dictyota dicho- loma. Annals Bot. 12: 559-560. 1905. .Studi(>s in the Dictyotaceao. III. The ])eriodicity of the .^exual cells of Dictyota dichotuma. Annals Bot. 19: 531-560. ,- ⢠f- *' ' T A Note on Stemonitis fusca Roth William D. Gray, University of Pennsylvania The phenomenon of fairy-ring formation by certain fungi has long been known to mycologists, and numerous workers have reported and figured this type of sporophore arrangement among various agarics. Among the Myxomycetes, however, there have been few reports of fairy- ring formation. Macbride (1899, p. 35) reports such formations as being common to Physa/rum cinereum (Batsch) Pers., stating that the rings are small, measuring but a few inches in diameter. More recently, Poteat (1937) reports the finding of quite large fairy-rings of P. cinereum. This author states that he has found rings as la
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