This passage is an extract of an article dtd. 01.4.1935, by Sri Ramapati Misra, President of the Bombay branch of the Varnasrama Svarajya Sanga, in Hindi.
In the second paragraph, the Author states that among the Sankaracharya Pithas with Dasnami Ascetics as their Heads, Five Pithas have been famous from the beginning.
(Sri Sankaracharya And Sankarite Institutions By Sri Anantanandendra Saraswati of Sri Upanishad Brahmendra Matha)