tetraspore
noun
one of the four asexual spores produced within a tetrasporangium.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Changed "tetrasporus" to "tetrasporous" on page 9 of part 2: "being entirely tetrasporous."
From Student's Hand-book of Mushrooms of America, Edible and Poisonous by Thomas Taylor