DISTRIBUTION AND SYSTEMATICS OFBATRACHOSPERMUM(BATRACHOSPERMALES, RHODOPHYTA) IN NORTH AMERICA. 3. SECTIONSETACEA1

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Abstract
Six populations ofBatirachospermumsectionSetaceafrom North America were compared to eight type specimens using multivariate morphometrics and image analysis. From this analysis, four species in this section were distinguished worldwide:B. atrum(Hudson) Hartley [syn.B. gallaeiSirodot]; B. orrthostichumSkuja,B. sertularina(Bory) Bory]; B. diatychesEntwisle; B. androinvolucrumsp. nov.; andB. puiggarianumGrunow in Wittrock et Nordstedt (syn.B. angolenseWelwitsch ex West et West,B. nigrescensWelwitsch ex West et West).Two of these species were found in North America: B. atrumin California and Texas andB. androinvolucrumin British Columbia, Washington State, and Alabama. The new species,B. androinvolucrum, is distinguished by having spermatangia restricted to one‐celled involucral bracts of the carpogonial branch.