The ubosot or ordination hall is built in a mixed late Ayutthaya and Rattanakosin style. The roof is three-tiered, while the extended roof over the elevated porches is two-tiered. Two entries can access the hall on the west and east sides. The north and south sides have five windows. The inside walls of the hall are nicely painted with the "Jataka" tales (3).
In the ubosot are magnificent old Buddha statues dating from the Lopburi, Sukhothai and Ayutthaya periods. A chedi stands in front of the ubosot instead of being positioned at the west of the hall. The chedi was likely a restored satellite chedi of Wat Phrom Kalayaram the original probably vanished with time. Wat Mai Sri Pho has a pretty large surface, indicating the former merging of Wat Sri Pho and Wat Phrom Kalayaram.
The site is mentioned on Phraya Boran Rachathanin's map drafted in 1926 CE and located in geographical coordinates: 14° 22' 12.31" N, 100° 33' 27.65" E.
Footnotes:
(1) Khlong Sra Bua, or the Lilly Pond Canal, is a canal situated in the northern area, off the city island, in the Khlong Sra Bua District. The waterway splits from Khlong Hua Ro between Wat Ngiu (defunct) and Wat Si Liam. The canal has its mouth at the City Canal (Khlong Mueang) between Wat Na Phra Men and Wat Mai in front of the northeastern corner of the Grand Palace. The canal was a shortcut in the old Lopburi River.
(2) Thung Khwan or "Field of Fumes" is an area north of the city of Ayutthaya bordered on the north by Thung Lum Phli, on the east by Khlong Sra Bua and Thung Kaeo, in the south by the old Lopburi River and in the west by Thung Phukhao Thong.
(3) The Jataka tales (Th: chadok) refer to a voluminous collection of folklore-like literature native to India concerning the previous incarnations of the Buddha Siddhartha Gautama, both in human and animal form. The tales were originally written in Pali and dated between 300 BC and 400 CE. The canonical book comprises 547 poems, arranged roughly by an increasing number of verses. Many tales are set in or near Benares (Varanasi), a city in north central India on the Ganges River. One of the world's oldest cities, Varanasi, is the most sacred place for Hindus. Buddhists and Muslims also have important religious sites nearby. According to tradition, Buddha began his teachings at Sarnath, a short distance from this city.