As used in this chapter “public land” is limited to land belonging to the State which is subject to entry or has been entered and for which no certificate of purchase has been issued.
When public land is affected, all notices required by this division shall promptly after issuance be served upon the State Lands Commission by mailing to its office a copy inclosed in a sealed envelope with postage prepaid.
No public land which was unentered at the time any assessment was levied against it by any district shall be sold for the delinquency of the assessment, but the assessment shall be and continue a lien upon the land, and no patent shall be issued therefor until the applicant presents a certificate from the collector stating that no unpaid assessments or charges are delinquent upon it.