Berlin and Bowen (2) observed paired centrioles adjacent to nuclei in vegetative hyphae, sporangiophores, and sporangia in the fungus Albugo candida. The centrioles were arranged end-to-end on the same axis "with little or no angle between them." Later these same authors suggested that the centrioles in an end-to-end orientation appeared to be in the process of replication (3) . Turner (11) not...

Universal primers for amplifying and sequencing a noncoding spacer between the atpB and rbcL genes of the chloroplast DNA were constructed from the published sequences of Marchantia (a liverwort), tobacco, and rice. Our results indicate an evolutionary trend of increasing spacer size from liverworts, through mosses, to vascular plants. This atpB-rbcL spacer is AT-rich, consistent with other chl...