Hitherto characters derived mostly from macromorphology were used to distinguish among the members of Acanthopsis Harv., a taxonomically difficult group plants endemic arid parts southern Africa. The taxonomic significance leaf and bract indumentum in was investigated using light, scanning electron microscopy. Five non-glandular three glandular trichome types distinguished on leaves floral brac...

CCORDING to a widely accepted view of the mechanism of ascospore forma-A tion in Neurospora crassa, a single diploid nucleus in the young ascus undergoes meiosis followed by mitotic division of the four resulting nuclei. A spore is formed around each of the eight products, sister nuclei from the mitotic divisions inhabiting adjacent spores. A second mitosis gives binucleate spores. This mechani...