Candida is one of only a few allergenic extracts representing the yeast group of molds.

Careless weed is a common weed found throughout the eastern US and the southern half of the western US.

Commonly found on deteriorating wood products, Chaetomium frequently emits a musty odor and is frequently found on water-damaged drywall.

Cladosporium herbarum, which is one of the most important molds in allergic disease. C. fulvum is limited almost exclusively to the leaf of the tomato plant, where it causes a leaf rot.

Found worldwide, the Cocklebur is a weed that flowers from early summer to mid-autumn.

The different species of Ustilago are identified specifically by the type of plant they most like to infect – in this case, Ustilago maydis targets corn, thus its common name Corn Smut.

Curvularia is a fairly common mold found outdoors as a seed crop pathogen, as well as in the soil. Indoors it has been found in house dusts, mattress dust, on wallpaper/newspapers and painted wood when humidity is elevated.

These weeds flower year-round but produce the highest levels of pollen from mid-spring to early winter.

Birch trees are among the most commonly encountered trees in the US. In terms of allergy, Birch is second only to Oak in causing tree allergies,