Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 10. Humaria rutilans (Fr.)San.: an ascus (n) the terminal cellconnected with which has continuedits growth and given rise to anotherascus (/>) from tin- terminal cell of whicha third ascus (c) has arisen, x 1250.. Fig. 11. Humaria rutilans (Fr.) Sacc.; a. asco-genous hypha showing sixteen chromosomes ineach nucleus, x 1950; 6. fusion nucleus of ascuspassingout of synapsis, x i^oojc. fusion nucleusof ascus showing sixteen gemini, X 19=0. observations have since been widely confirmed by a number of investi-gators, and synapsis, the second c
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Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 10. Humaria rutilans (Fr.)San.: an ascus (n) the terminal cellconnected with which has continuedits growth and given rise to anotherascus (/>) from tin- terminal cell of whicha third ascus (c) has arisen, x 1250.. Fig. 11. Humaria rutilans (Fr.) Sacc.; a. asco-genous hypha showing sixteen chromosomes ineach nucleus, x 1950; 6. fusion nucleus of ascuspassingout of synapsis, x i^oojc. fusion nucleusof ascus showing sixteen gemini, X 19=0. observations have since been widely confirmed by a number of investi-gators, and synapsis, the second contraction and the formation of typicalgemini have been seen, as well as the reduction of the chromosome number.Thus in Humaria rutilans, which the exceptionally large nuclei rendera convenient subject of study, each of the fusing nuclei possesses sixteenchromosomes (fig. 11 a), so that the definitive nucleus has thirty-two ; aftermeiosis is complete sixteen can be counted in each daughter nucleus. Thisfungus is somewhat exceptional in that synapsis begins separately in eachof the two nuclei of the young ascus before they fuse (fig. 8 b) indicating 44 ASCOMYCETES [CH. that each of them is already diploid, the product of a sexual fusion, andcapable of independen