• description      TITLE: stolon (biology)     ...called a
runner—is a slender stem that grows horizontally along the
ground, giving rise to roots and aerial (vertical) branches at
specialized points called nodes. In zoology, stolons of certain
invertebrate animals are horizontal extensions that produce new
individuals by budding. Fungi spread by means of horizontal
filaments (hyphae) that are also called stolons.   • sponge
TITLE: sponge (animal): Asexual reproduction     SECTION:
Asexual reproduction     ...germinate, their archaeocytes emerge
through an opening (micropyle), the various cellular types
differentiate, and a new sponge grows. Other methods of asexual
reproduction include formation of stolons (rootlike extensions)
and fragmentation of individuals.