What effect does Brown Rot Fungi have on wood?

Brown Rot Fungi primarily affects the cellulose and hemicellulose within the wood structure. As it degrades these components, the wood loses its strength and integrity. The decay process results in the formation of cubic fractures, leading to a characteristic breakdown where the wood can be easily broken into cuboidal pieces. This specific type of decay significantly differs from other forms of wood deterioration, as it has a distinct visual appearance due to the cracking and fragmentation.

In contrast, the other options suggest effects that do not occur with brown rot. The lightening and fibrous nature mentioned would be more characteristic of other decay types, while claiming that brown rot has no effect or solidifies the structure of wood contradicts the well-documented destructive nature of this fungus. Thus, understanding the consequences of brown rot fungi is essential for managing wood health and preventing structural damage in affected areas.