Rosaria
Rosaria N. Carter, J. Linn. Soc., Bot. 46(1): 54 (1922).
Index Fungorum number: IF 30285; Facesoffungi number: FoF 11090, 1 morphological species (Species Fungorum 2022), no molecular data available.
Associated with algae. Absence of heterocysts, branching irregular, usual absence of thin, firm sheath. Branching sparse and irregular, branches arising in all directions and branches of second order more frequent. Branches practically at right angle with the parent branch and all the cells both of the main axis and the branches are similar to each other becoming slenderer towards the apex. Gelatinous sheath present, hyaline, surrounding the filaments (adapted from Carter 1922).
Type species: Rosaria ramosa N. Carter
Notes: Rosaria forms a thin mucous film together with Gloethece vibrio and Mastigocoleus ramosus over excrescences on the bark of trees. It lacks heterocysts and has irregular branching. Rosaria differs from similar genera such as Hapalosiphon in having apical growth by the budding of the apical cell and the continued growth of the small part budded off until it is large enough to form a distinct cell. Rosaria is also characterised by hyaline gelatinous sheath which becomes firm and yellowish on maturity and forms a strange radiating structure which recalls the structure of the mucous sheath in filamentous Desmids. The alga associated with Rosaria ramosa namely Mastigocoleus obtusus is deprived of heterocysts even though other species of the genus Mastigocoleus have heterocysts. The placement of Rosaria is uncertain due to lack of molecular data and it is currently in Capnodiales, genera incertae sedis.
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