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Taxonomic and nomenclatural notes on Anotrichium tenue and related species (Ceramiaceae, Rhodophyta)

Anotrichium tenue (C. Agardh) Nageli is widely distributed in the Mediterranean Sea. It has also been reported from warm waters of the Atlantic, Pacific, and Indian oceans. The species, originally described as Griffithsia tenuis C. Agardh from sterile specimens collected at Venice (Adriatic Sea), was reported from the same area by Zanardini (1841: 171). The main vegetative characters which distinguish A. tenue from related species are the sparse subsecund branching and the origin of branches from the lower ends of cells, as pointed out by Harvey (1858: 130) who examined an "authentic" specimen of "Agardh's G. tenuis from the Mediterranean". Nageli (1862: 397) assigned Griffithsia tenuis to his new genus Anotrichium, which differs from Griffithsia C. Agardh in having tetrasporangia and spermatangia borne singly on basal cells and not in fascicles. He divided Anotrichium, in turn, into two subgenera: A. subg. Anotrichium ("Euanotrichium"), comprising the single species A. barbatum (C. Agardh) Nageli, with a tetrasporangium borne at the distal end of the basal cell of a whorled branch, and A. subg. Coryphosporium Nageli, comprising the single species A. tenue, for which he described the tetrasporangia as being borne terminally on unicellular whorled pedicels. Hauck (1885: 91) described similar tetrasporangia in specimens from the Adriatic Sea. Neither author mentioned the number of sporangia per node. Feldmann-Mazoyer (1941: 411) gave a detailed description of a tetrasporangial specimen from Algeria (western Mediterranean), pointing out that sporangia are borne terminally on pedicels, with 5 to 8 pedicels in each whorl. The same tetrasporangial disposition (Fig. 1-2) is apparent in subsequent reports of this species