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The rhizomorphs of Marasmius androsaceus fries

1961; Cambridge University Press; Volume: 44; Issue: 1 Linguagem: Inglês

10.1016/s0007-1536(61)80008-9

0007-1536

J. A. Macdonald, Margaret A. Cartter,

Chemical synthesis and alkaloids

Rhizomorphs were formed on the dikaryotic mycelium only. On agar slants they developed equally well whether theinoculum was mycelium or rhizomorph tip. To a limited degree only, the presence of rhizomorphs restricted the production of new rhizomorphs. They developed better on oatmeal- than on malt-, heather-stem-sawdust-, or heather-leaf-extract-agar. Initials were most numerous on this last agar, but subsequent development was limited. Mycelial growth was restricted and rhizomorph development inhibited when the pH value of the medium was as high as 7 or as low as 4. Over the range of temperatures from 35 to 15°C, 20°C. gave best development. Rhizomorphs developed freely in atmospheres with high relative humidity (76–89%), but did develop also at very low relative humidity. Maturation of fructifications was restricted to cultures growing within the higher humidity range. Rhizomorphs responded negatively to gravity, and positively to light of sufficient intensity. Both mycelium and rhizomorph tips gave a positive reaction with Nobles's (1958) test for extracellular oxidase, indicating ability to attack lignin. Rhizomorphs did not tend to twine round glass rods or pieces of dead or living stems of several woody species of plants that were tested, but they did twine round and adhere to living stems of Calluna vulgaris. Under humid conditions, these living stems were penetrated, and the tissues of bark, wood and pith were invaded, within a period of 12 weeks.