A subsporangial vesicle is a vesicle which is below the sporangium

Sporangium

A sporangium is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. All plants, fungi, and many other lineages form sporangia at some point in their life cycle...

 on a fungus

Fungus

A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds , as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria...

.

Is often used in the turgor-building and release to launch the sporangium

Sporangium

A sporangium is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. All plants, fungi, and many other lineages form sporangia at some point in their life cycle...

 from the stalk

Stalk

Stalk may refer to:* Plant stem, one of two main structural axes of a vascular plant* Leaf stalk, also known as Petiole* Flower stalk, also known as Peduncle* Stalking, an act of intrusive behavior or unwanted attention towards a person...

 of the fungus

Fungus

A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds , as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria...

 using this spore-dispersal method.

e.g. The subsporangial vesicle in Pilobolus

Pilobolus

Pilobolus is a genus of fungi that commonly grows on herbivore dung.-Life cycle:The life cycle of Pilobolus begins with a black sporangium that has been discharged onto a plant substrate such as grass. A herbivorous animal such as a horse then eats the substrate, unknowingly consuming the...

fills with fluid, thereby creating turgor pressure that is released, launching the sporangium out towards the light, with the intent of landing on a plant.