Abstract
Abstract Gainia mollis gen. et sp. nov. is a soft, slippery, deep-red crust that grows subtidally along the Antarctic Peninsula and in East Antarctica. Fragments of the thallus separate easily under pressure into the constituent filaments. The hypothallus consists of one to several loosely organized layers of prostrate filaments. The perithallus consists of erect filaments that are not joined by secondary pitconnections or fusions. Carpogonial branches and auxiliary cells are produced among paraphyses in a nemathecium. The auxiliary cell is intercalary in an extension of a differentiated perithallial filament. Tetrasporangia, which are not in nemathecia, terminate perithallial filaments at the surface of the crust. They are divided in an obliquely cruciate or irregularly zonate fashion. Gainia differs vegetatively and reproductively from crusts of the Peyssonneliaceae, Blinksiaceae, and Cruoriaceae. It is assigned to a new family in the Cryptonemiales.
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