Lodges are governed by national, state or provincial authorities, usually called Grand Lodges or Grand Orients, whose published constitutions define the structure of freemasonry under their authority, and which appoint Grand Officers from their senior masons. Provincial Grand Lodges (which in England generally correspond to historic counties) exercise an intermediate authority, and also appoint Provincial Grand Officers.
Different grand lodges and their regions show subtleties of tradition and variation in the degrees and practice; for example under the Grand Lodge of Scotland, the Mark Degree (which is unrecognised by the United Grand Lodge of England, but has a separate Mark Grand Lodge) is integrated into “The Craft” as a completion of the second degree. In any case, Grand Lodges have limited jurisdiction over their member Lodges, and where there is no prescribed ritual Lodges may thus have considerable freedom of practice. Despite these minor differences, fraternal relations exist between Lodges of corresponding degrees under different Grand Lodges.
(the source/read more: Wikipedia)
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