"Section 107. All patents or certificates for land granted under this Act shall be prepared in the Bureau of Lands and shall be issued in the name of the Government of the Republic of the Philippines under the signature of the President of the Philippines: Provided, however, That the President of the Philippines may delegate to the Undersecretary of Agriculture and Natural Resources the power to sign patents or certificates covering lands not exceeding one hundred forty-four hectares in area, and to the Secretary of Agriculture and Natural Resources the power to sign patents or certificates covering the lands exceeding one hundred forty-four hectares, in area, in which case such patents or certificates shall bear the official seal of the Department of Agriculture and Natural Resources instead of the great seal of the Republic of the Philippines. Such patents or certificates shall be effective only for the purposes defined in section one hundred and twenty-two of the Land Registration Act, and actual conveyance of the land shall be effected only as provided in said section.