Thus the biologic form on B.
88 and 90 (1901-1902); Salmon, "Cultural Experiments with ` Biologic Forms ' of the Erysiphaceae," Phil.
A few examples are appended: Some of the Uredineae also exhibit the peculiarity of the development of biologic forms within a single morphological species, sometimes termed specialization of parasitism; this will be dealt with later under the section Physiology.
The terms biologic forms, biological species, physiological species, physiological races, specialized forms have all been applied to these; perhaps the term biologic forms is the most satisfactory.
Graminis to various species of the genus, Bromus, that certain species may act as "bridging species," enabling the transfer of a biologic form to a host-plant which it cannot normally infect.