AskDefine | Define microspore

Dictionary Definition

microspore n : smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte

User Contributed Dictionary



  1. A small spore.


  • OED2

Extensive Definition

In biology, a microspore is a small spore as contrasted to the larger megaspore. This combination is found only in heterosperous organisms. Most plants that reproduce by spore without seed only produce one class of spore. In the ferns, the only megasporous plants are aquatic or semi-aquatic, including the genera Marsilea, Regnellidium, Pilularia, Salvinia, and Azolla. This condition is also known in the lycopod genus Selaginella.
microspore in French: Microspore
microspore in Serbian: Микроспора
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