White rot associated with stub in white pine Figure 93 Close-up of white rot in pine. White rot . The cellulose and lignin are digested at about equal rates. The digestion usually starts from the cell lumens and proceeds towards the middle lamella. These terms describe their macroscopic appearance.
White rots occur also in wood products such as utility poles.
Some of the most damaging fungi associated with white rots are Phellinus pini, Armillariella mellea, Fomitopsis annosa, Ganoderma applanatum, Oxyporus populinus, Phellinus igniarius, Innotus glomeratus, I. obliquus , and Echinodontium tinctorium. Figure 95 Closeup of brown rot in pine Brown rot. The cellulose is digested preferentially, and the lignin is only altered slightly in this type of rot. Brown rots have a shrunken cubical appearance. Brown rots occurs mostly in gymnosperms and in wood products.