Emended Description of the Genus Pseudonocardia Henssen and Description of a New Species Pseudonocardia spinosa Schafer

Acropetal hyphal budding and production of blastospores characteristic of the genus Pseudonocardia Henssen and designated as Pseudonocardia-type were studied by time-lapse photography. The formation of cross walls in the aerial hyphae of Pseudonocardia thermophila was reexamined. Not all segments of the articulated hyphae are limited by septa. The new species Pseudonocardia spinosa Schäfer is described. The type strain of this species is MB SF-1 (ATCC 25924, CBS 818.70). P. spinosa corresponds with the type species of the genus in the acropetal budding of the hyphae, in the formation of blastospores, in the composition of the cell wall (type IV), and in the occurrence of a yellow pigment; it differs mainly in being mesophilic and in possessing spiny spores.