A pore or pore surrounded by two crescent-shaped guard cells located in the leaves and young green stems of plants is called a leaf spore. The lower skin of the opposite sided leaf and the two skins of the same sided leaf have stomata. The aerial parts of plants such as leaves, shoots, petals, fruits etc. have stomata. Leaves may have 1,000-60,000 pores per square centimeter. When open, the stomata are 10-40 cm long and 3-12 cm wide.