DISTRIBUTION AND SYSTEMATICS OFBATRACHOSPERMUM(BATRACHOSPERMALES, RHODOPHYTA) IN NORTH AMERICA. 1. SECTIONCONTORTA1

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Abstract
Multivariate morphometrics and image analysis were used to determine the number of well‐distinguished infra‐generic taxa in the sectionContortaof the freshwater red algal genusBatrachospermumin North America. Five groupings were distinguished from 29 populations examined from New Mexico to Costa Rica. These entities were statistically related to 12 type specimens reported from or similar to North American populations. The following taxa were recognized:B. ambiguumMontagne (syn.B. bicudoiNecchi andB. basilareFlint et Skuja)B. globosporumIsraelson (syn.B. cipoenseKumano et Necchi andB. jolyiNecchi),B. intortumJao,B. louisianaeSkuja andB. procarpumSkuja var.americanumvar. nov. The new variety differs from the nominate variety in having significantly larger whorls and smaller carpogonia.Batrachospermum ambiguum, B. louisianae, andB. procarpumvar.americanumoccur in low ion waters (10–187 μS·cm−1), whereasB. intortumandB. globosporumare found in high ion waters (260–1760 μS·cm−1). Detailed descriptions and a key to the five taxa are given.

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