New Species and Varieties of Aspergillus

SUMMARY

A great many strains of Aspergillus have been isolated and examined since the publication of the “Manual of the Aspergilli” by Thom and Raper in 1945. Among this number, strains representing five new species and five new varieties have been encountered. The new species and varieties are described in the present paper, and include:

1.	Aspergillus paradoxus, doubtfully a member of the A. clavatus group, characterized by small clavate vesicles and the production of yellow sclerotium-like bodies.
2.	Aspergillus aureolus, an ascosporic member of the A. fumigatus group, characterized by vegetative mycelium in bright golden shades and ascospores with convex surfaces conspicuously echinulate.
3.	Aspergillus fischeri var. glaber, duplicating the species in most particulars, but producing ascospores with convex surfaces smooth. (A. fumigatus group.)
4.	Aspergillus violaceus, an ascosporic member of the A. nidulans series, characterized by a paucity of conidial structures and ascospores in deep violet-blue shades.
5.	Aspergillus nidulans var. acristatus, duplicating the species generally but producing ascospores without equatorial crests or surface ornamentation.
6.	Aspergillus nidulans var. echinulatus, duplicating the species in most particulars but producing ascospores with convex surfaces echinulate rather than smooth.
7.	Aspergillus variecolor var. astellatus, duplicating the species generally, but showing lobed asci and producing ascospores with wide, non-stellate crests. (A. nidulans group.)
8.	Aspergillus deflectus, a member of the A. ustus group, characterized by restrictedly growing colonies and conidial heads borne at or near right angles to the main axes of the conidiophores.
9.	Aspergillus silvaticus, a non-ascosporic form which appears to be intermediate between the A. versicolor and A. nidulans groups.
10.	Aspergillus terreus var. africanus, duplicating the species in most characteristics but producing abundant yellow sclerotium-like bodies.

The description of Aspergillus unguis, previously recognized as a non-ascosporic member of the A. nidulans group, is emended to include a strain which produces occasional perithecia and ascospores approximating those of A. nidulans.