STUDIES IN THE GENETICS AND CYTOLOGY OF TWO SPECIES IN THE GENUS ASTER AND THEIR POLYMORPHY IN NATURE

The following genetical and cytological studies were made in conjunction with investigations in relative growth and morphogenesis (Delisle, 1938) in two species of Aster, A. novae-angliae L., A. multiflorus Ait.² and their hybrid. Certain aspects of this work appear significant when considered in relation to the polymorphy of these species and possibly have a bearing on the recognized polymorphy in the genus. A. novae-angliae is tall, hairy, stout, and relatively unbranched in the young stages, becoming corymbed only at the summit later. It has numerous large, soft, minutely pubescent, lanceolate, acute, entire leaves which are provided with marked auriculations at the base. The bracts of the involucre are loose, erect, nearly equal, glandular-viscid and linear; the heads are characteristically solitary on individual branchlets; the rays of the type species are violet-purple and those of the forms roseus (Desf.) Britton and geneseensis. House are rose and white, respectively. This species flowers from August to October, with the bulk of the plants blooming in September.     

Timing of a single daily meal affects daily serum prolactin rhythm in gulf killifish, Fundulus grandis

Fish fed at one of two different times of day had differences in mean levels of serum prolactin throughout the day. Although the forms of the daily rhythms from the two groups were similar, they differed at one time of day.     

HYBRIDIZATION OF PANUS TIGRINUS AND LENTODIUM SQUAMULOSUM

Crosses between monokaryotic isolates of two strains of Lentodium squamulosum and one strain of Panus tigrinus showed complete intercompatibility. Hybrid fruits from crosses between monokaryotic isolates of L. squamulosum and P. tigrinus were uniformly like the P. tigrinus parent. Though both isolates of L. squamulosum showed considerable variability in form, merging toward P. tigrinus, L. squamulosum could always be distinguished from P. tigrinus from hand sections of the hymenophore. The significance of these results as they bear on the problem of inter-relationships between hymenomycetes and gasteromycetes is discussed. L. squamulosum is recognized as variety squamulosus of P. tigrinus.