. ? Fio. 24".—Pcridermium pini {corlieolu). c, n. Mycelial stroma developed in tlic rind; the host-cells have become isolated from each other and contain haustoria, h, of the fungus, h, Basidia composed of much smaller cells than in the needle-inhabiting aecidia. j>, The peridium. (After R. Hartig.) young plants soon succumb to attack, the struggle witli old trees may go on for years. Fresh infection of older stems occurs generally in tb.' biglicr parts of the tree, where the bark is still thin. Pycnidia (spermogonia) are developed between the rind- parenchyma (periderm) and cork, gene

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. ? Fio. 24".—Pcridermium pini {corlieolu). c, n. Mycelial stroma developed in tlic rind; the host-cells have become isolated from each other and contain haustoria, h, of the fungus, h, Basidia composed of much smaller cells than in the needle-inhabiting aecidia. j>, The peridium. (After R. Hartig.) young plants soon succumb to attack, the struggle witli old trees may go on for years. Fresh infection of older stems occurs generally in tb.' biglicr parts of the tree, where the bark is still thin. Pycnidia (spermogonia) are developed between the rind- parenchyma (periderm) and cork, generally towards the margin of diseased spots. The conidia emerge from the ruptured cork-layers of the bark as a honey-sweet liquid. H. Mayr states that this liquid is given off in such quantity from species of Pcrulerwiinii in Japan, that it is collected and eaten bv tlie natives.