Abstract
Abstract Botryocladia ardreana sp. nov. was collected from Portugal, where it has been known as B. boergesenii, and maintained in culture for over 10 years. Plants in culture reach 77 mm in length. They consist of a basal disc or a dichotomously divided basal rhizoidal system that gives rise to upright stipes on which vesicles are borne terminally or laterally. The vesicles, which are 2–4 mm in diam. and up to 70 mm long, are ovate or elongate-cylindrical, and are simple or branched up to five times. Vesicle walls consist of three layers, the outermost of which forms an irregular network over the middle layer. Plants are dioecious. Male plants produce spermatangia in relatively unmodified sori. Female plants produce few carpogonial branches, which are composed of four cells. Gonimoblast development takes place outwards into a cavity formed by stretching of subcortical cells. A tela arachnoidea that persists in the mature cystocarp is formed by this stretching process. Mature cystocarps bulge prominently o...
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