Abstract
Since we accept the genus Thelypteris Schmidel in a broad sense, including such segregates as Christella Leveille, it is necessary to provide the appropriate combination for C. guamensis in Thelypteris. Wagner and Grether (Occ. Pap. Bishop Mus. 19:56. 1948) list as Cyclosorus dentatus (Forsk.) Ching the two collections cited by Holttum (Grether 4384, 4385). We could not match these exactly in the considerable series of specimens from Guam labelled T. dentata or T. parasitica. The thickened, reddish, glandular hairs scattered over the underside of the lamina, the pubescence of two ranges of length, the broad fronds with the lowest pinnae only slightly or not reduced, and the short-creeping rhizome would seem to place T. guamensis between T. dentata and T. parasitica. We follow Holttum in recognizing T. guamensis as a separate species, but with some misgivings. The Guam plants of this affinity do not sort well into three, and even less well into two, populations.
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