Reproduction in the Rusts

Nuclear Structure and Behavior in Species of the Uredinales

“…The contents are amorphous in appearance rather than granular or reticulate, and so were presumably not living at the time of fixation. These hyphae are very similar in appearance to those seen by Andrus (1931) associated with the pycnia of Uromuces appendiculatus, and by Rice (1933) associated with the pycnia of Puccinia Borghi. Both these writers considered them to be trichogyne tips.…”

“…Andrus (1931) saw what he termed trichogyne tips emerging from the stomata of bean leaves infected by Uromyces ap pendiculatus but presented no conclusive evidence that the pycniospores fused with them or that they led directly to the aecial primordium. Rice (1933) reported similar hyphae in the stomata of Oxalis leaves infected by Puccinia Sorghi and considered them to be trichogynes. Lamb (1935), working with Puccinia Phragmitis, reported the fusion of pycniospores with ostiolar hyphae but could not distinguish the two distinct types described by Craigie.…”