Abstract
Abstract A description is provided for Poria hypobrunnea . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On cacao, rubber, tea, dadap ( Erythrina sp.), Tephrosia candida, Crotalaria anagyroides, Spathodea campanulata , Crotalaria incrassata . DISEASE: Root rot and stem canker, sometimes known as Poria root rot or red rust rot. Both these names can be misleading, as they are also used to refer to root infections caused by Poria hypolaterita . Woody tissues of trees attacked by the fungus are decayed to a soft, friable condition and are permeated by red mycelium. The flat sporophore is rarely found in association with infected tissues. Poria hypobrunnea is believed to be able to infect dead snags on tea bushes in Assam, producing a dieback and canker condition (27: 260), but more recent work by Agnihothrudu (44, 3142; 45, 596) suggests that this condition may be caused by P. punctata . GEOGRAPHICAL DISTRIBUTION: Africa (Ghana); Asia (Ceylon, India (Assam), West Malaysia). TRANSMISSION: The fungus spreads from infected stumps into the soil by means of rhizomorphs that are at first red and later become black. At times the rhizomorphs fuse to form red sheets; the interior is white at all stages. Stump infection is said to occur by air-borne basidiospores (45, 36).
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