The phenomena of dissociation into S and R forms observed among the bacteria do also occur in yeast cultures

Conclusions

From the study of our yeasts, followed during some months, we are able to draw the following conclusions:

• 1. Cultures of yeasts show dissociation phenomena, giving rise to the two fundamental types S and R, which continue in subcultures the newly acquired characters.

• 2. The general mycological aspect of the R type is characterised by the predominance of the filamental mycelium over the blastospore, predominance which is often so pronounced that gives rise to the suspicion that we are dealing with a different species or genus contaminating the primitive culture.

• 3. The dissociation into S, R and the intermediate forms observed in yeasts and yeastlike germs seems to cover a wider field, extending to other genera of fungi.

• 4. The knowledge that the mycological aspect of the S and R forms in yeasts is so different one from another is particularly interesting for medical mycology, as many of the modern classifications of these fungi are mostly founded on micromycological characters. On this ground a revision of the modern taxonomy is badly required.