Rudimentary anthers with or without sporogenous tissue occur in a few plants of F. glabella, F. hispida, F. pumila and F. tomentosa (this Vol.). In these, either PMC’s are not developed or they degenerate before meiotic initiation. However, in a clone of F. pumila var. minima, PMC’s abort after separation before the pachytene. The mst appears genetic, as other nearby-growing plants of these species are fully mft.