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Can't be sure if right half (it appears rotting damage originates from surface bulb) of image is same thing as left, it cerainly apperas so.
Note small crater on top of each bulb.

image: http://agrozoo.ne...e3d8225060

Disection of 'healthy' bulb discovers nothing but thin tunel, maybe 2x as long as bulb itself, rather similar as at depressions here: http://agrozoo.ne...0681173d06