The diseases of the sweet The diseases of the sweet pea .. diseasesofsweetp00taub Year: 1914 16 a parallel series of inoculations was also run, using 'the Thielavia basi- cola from the sweet pea. The results obtained were the same, i. e. the Thielavia fungus when taken from other hosts than the sweet pea will readily infect the sweet pea, thus showing the absence of physiological strains or species. Morphology of Thielavia basicola. Our studies and observa- tions on this fungus have brought out facts found by other investiga- tors. The mycelium of the fungus is hyalin, septate and branched.
The diseases of the sweet The diseases of the sweet pea .. diseasesofsweetp00taub Year: 1914 16 a parallel series of inoculations was also run, using 'the Thielavia basi- cola from the sweet pea. The results obtained were the same, i. e. the Thielavia fungus when taken from other hosts than the sweet pea will readily infect the sweet pea, thus showing the absence of physiological strains or species. Morphology of Thielavia basicola. Our studies and observa- tions on this fungus have brought out facts found by other investiga- tors. The mycelium of the fungus is hyalin, septate and branched. The hyphas average from 3-4u in width. The mycelium becomes more or less greyish with age. There are three kinds of spore forms pro- duced. 1. Endospores, so called because they are formed inside a special thread of the mycelium. This is the spore form that is most commonly met with in pure cultures of artificial media. The endo- Fig. 3. Endospores. Figs. 4, 5. Chlamydospores breaking up into individual spores. Fig. 6. Chlamydospores, unbroken. Fig. 7. Ascospores. Fig. 8. Ascus. spore case is formed on terminal branches. It has a somewhat swol- len base and a long tapering cell (Fig. 3). The endospores are form- ed in the apex of this terminal cell and are pushed out of the rup- tured end by the growth of the unfragmented protoplasm of the base. They are hyalin, thin-walled, oblong to linear 10-25ux4-5u. The second kind of spores formed are the chlamydospores (Figs. 4-6). These are thick-walled dark brown bodies, born on the same mycelium as the endospores, and average from 20-50uxl0-18u, and correspond to the Torula stage of Berkeley's classification.
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