The feet of a gull showing webbed toes. Webbed toes is the common name for syndactyly affecting the feet. It is characterised by the fusion of two or more digits of the feet. This is normal in many birds, such as ducks; amphibians, such as frogs; and mammals, such as kangaroos.he feet of a gull showing webbed toes. Webbed toes is the common name for syndactyly affecting the feet. It is characterised by the fusion of two or more digits of the feet. This is normal in many birds, such as ducks; amphibians, such as frogs; and mammals, such as kangaroos.
The sporangia produce very tiny spores. Spores are different to seeds. They do not contain plant embryos or food stores. When the sporangia break open, the spores are released and dispersed by the wind.If the spore lands in a suitable environment, it can grow into a tiny plant called a gametophyte.he sporangia produce very tiny spores. Spores are different to seeds. They do not contain plant embryos or food stores. When the sporangia break open, the spores are released and dispersed by the wind.
Homospory characterizes plants that produce spores that are all the same size (as in bryophytes and most seedless vascular plants). Homospory can result in bisexual gametophytes (as in ferns, pg 611) or unisexual gametophytes (male or female) as in mosses - see pg 607 in the text. Heterospory characterizes plants that produce spores of different sizes: megaspores and microspores which give rise to separate female and male gametophytes, respectively. Contrast sperm delivery in seedless plants with sperm delivery in seed plants.