In Maryland, an individual can seek a divorce on several grounds.  As on October 1, 2015, individuals who have been separated for six months, have no children and have reached a resolution of all issues relating to their marriage can seek a divorce based upon "mutual consent."  Both parties are required to appear in court for the divorce hearing.  However, a corroborating witness will not be required.
The other grounds for divorce remain:  a separation lasting more than 12 months, adultery, cruelty, abandonment, excessively vicious conduct, insanity or conviction of a felony.

If the parties are unable to come to an agreement on the issues existing between them, the divorce will be contested and a judge or family law magistrate will make a determination on such issues as grounds for the divorce, custody, access, child support, alimony, use and possession of the family home, attorney's fees, a division of marital property, pensions and retirement accounts.
If the parties are able to resolve their differences, the court will hold a ten minute uncontested divorce where at least one of the parties will confirm the date of marriage, the date of separation, the grounds for divorce and the existence of a separation or settlement agreement.
All divorces, other than a mutual consent divorce, must have a corroborating witness.

The above statement is not legal advice and is not meant to take the place of consultation with a licensed professional.  You should always speak with an attorney before taking any legal action.