Enteromorpha Link is primarily a marine genus that has been occasionally reported from inland salt springs and some inland lakes with high salt concentrations (Collins, 1909; Smith, 1950). In contrast to marine species, the mature thalli of most freshwater Enteromorpha consist of long, usually branched, hollow tubes with a wall one cell in thickness (Fig. 1). Only two species of Enteromorpha have been previously reported from Kansas, each on the basis of a single collection. The first was E. intestinalis (L.) Link from Cheyenne Bottoms in Barton County, by McFarland et al. (1964) and the second was E. prolifera (Muell.) Ag. from the Big Salt Marsh part of the Quivira National Wildlife Refuge in Stafford County, by Reinke (1977) and is now referred to subsp. prolifera. Recent reports of Enteromnorpha from Oklahoma (Vinyard, 1966; Pfiester et al., 1976; Conner et al., 1978) exemplify that the inland distribution is poorly known. A total of three species (E. compressa (L.) Greville, E. torta (Mert) Reinbold and E. flexuosa (Wulfen ex Roth) ag. [=E. prolifera var. tubulosa (Kuetz.) Reinbold] have been reported from Oklahoma each on the basis of a single collection. However, Pfiester et al. have suggested that Enteromorpha is probably more common in inland areas than previously believed. E. prolifera subsp. prolifera has also been collected in Nebraska (Keith County, 7 mi NE Ogallala below Lake McConaughy, 20 Sept. 1978 by R. Brooks s.n.). Fieldwork by the State Biological Survey of Kansas has added 16 additional collection sites for E. prolifera (Muell.) Ag. subsp. prolifera in Kansas and supports the suggestion that Enteromorpha is more common than would be indicated by the algal literature. E. prolifera subsp. prolifera differs from E. compressa, E. torta and E. flexuosa by having a smaller cell size (9-18 x 6-12 g) in the mature thallus, square to rectangular cells, and the cells arranged in distinct longitudinal rows. The new specimen records from Kansas are: 1) Dry Lake, Scott County, 6 mi S and 8 mi E Shallow Water, 19 July 1977, D. Reinke #53; 2) Crooked Creek, Meade County, 17?2 mi S and 712 mi E Meade, 3 Aug. 1979, D. Reinke #83; and 14 mi S Meade, 23 Sept 1980, D. Reinke 440; 3) a spring fed marsh, Pratt County, ?2 mi N Cario, 30 April 1978, D. Huggins and P. M. Liechti #3; 4) Big Sandy Creek, Clark County, 10 mi S Ashland, 23 Sept. 1980, D. Reinke #443; 5) Salt Creek, Rice County, 3 mi S Raymond, 21 Oct 1980, D. Reinke #469; and 6) Willow Creek, Wallace County, SE 4, Sec 12, T13S, R42W, 9 Jul 1980, McGregor #31829. Dry Lake is a stilling