E. S. SALMON ON NEW OR RARE BRITISH FUNGI. 375 



Currey founded the genus Ao'thi'odei'ma in 1854, in the "Quarterly 

 Journal of Microscopical Science," II., p. 242, pi. ix., ff. 6-8. 

 Saccardo, in the " Sylloge," has transferred the fungus on which 

 the genus was founded to the genus Illosporium, but it is, I think, 

 certain that the present species should not be placed in that 

 genus. In lUosjJoi'ium the sporodochium is subgelatinous and 

 waxy, the conidia being held together by mucus, — in Arthroderma 

 the whole structure is iioccose, and there is also the presence of 

 the curiously articulated hyphse described below. 



The following description was drawn up from the Kew specimens 

 which agree perfectly with authentic examples of A. Curreyi : — 

 Csespitulis glomeratim ordinatis, floccosis, albidis, tactu vitellinis, 

 e hyphis articulatis 5 — 6 /x latis flexuosis repetito et intricatim 

 ramosis formatis, articulis cylindraceis utrinque inflatulis 

 (ossiformibus), ramorum apicem versus brevioribus, omnibus 

 deinde plus minus minute asperulis, conidiis numerosissimis, 

 minutis, sessilibus, discoideis, 2 — 2*5x1 yu,, laevibus. 



Forming little globular balls (from | — | mm. in diameter), 

 which are frequently aggregated into a clinging floccose mass. 

 The general habit and appearance much recall a species of Arcyria, 

 and the intricately wound and much-branched hyphse resemble 

 superficially the capillitium found in that genus. The thigh- 

 bone-shaped (ossiform) articulations of the hyphse are somewhat 

 similar to those found in Nematogonium. 



Explanation of Plate 20. 



Figs. 1 — 3. Microsphcera Bdu7nleri P. Magn. 1, a nearly 

 mature perithecium, with appendages x 150 ; 2, apex of 

 a mature appendage x 400 ; 3, ascus and ascospores 

 X 400 ; all from specimens (now in Herb. Kew) sent 

 by Prof. Magnus. 



Figs. 4 — 7. Humaria carneola (Saut.) Wint. 4, ascophore, 

 attached by its mycelium to the stem of Tetraplodon 

 mnioides B. & S., x 68; 5, tetrasporous asci (with 4 

 rudimentary spores) and paraphyses, x 400 ; 6, 

 octosporous ascus x 400 ; 7, ripe ascospores x 400 

 (all from the Scotch specimen, now in Herb. Kew). 



