Mycetangial Glands and Their Seasonal Changes in Gnathotrichus retusus and G. sulcatus1, 2

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Abstract
The fungus repositories of male Gnathotrichus retusus LeConte) and G. sulcatus (LeConte) were found to contain glandular epithelium. The gland cells are activated the end of hibernation. During the flight period, the cells secrete through funnel-shaped openings into the lumen of the mycetangium and are depleted by the time the beetles prepare their brood gallery. Development of the symbiotic fungus is synchronized with the development of glands. Fungus cells are taken into the mycetangium at the end of hibernation; in the presence of the secretion, they proliferate and are disseminated in the new galleries. After the gland cells are depleted they deteriorate.

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