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SUMMARY Hyphal wall preparations of Scliizopl~yllum commune were treated with enzymes and the dissolution of wall components and the degradation of septa were simul- taneously recorded. The breakdown of the alkali-insoluble R-glucan (/&I ,3, /1-1,6-glucan) by R-glucanase was not influenced by the presence of chitinase but the breakdown of chitin by chitinase was stimulated by R-glucanase. The com- bination of R-glucanase and chitinase also had a synergistic effect on crosswall degra- dation. This indicates that the crosswalls contain both chitin and R-glucan, the chitin probably em bedded in R-glucan. S-glucan (x- I ~-glucan), a prominent com- ponent of the lateral walls, is apparently absent from the crosswalls. The septal swellings consist of material that is alkali soluble but different from S-glucan. Crosswalls in hyphal wall fragments from a dikaryon were much more resistant to enzymic dissolution than those in hyphal wall fragments from a monokaryon. Such a difference could not be noted in the dissolution of wall components. The results are discussed with regard to their significance for sexual niorphogenesis in Sch izoplij 3Ilum commune ,

Efizymic Degradation of Septa in Hyphal Wall Preparations from a Monokaryon and a Dikaryon of Schizophyllum commune