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Helminthosporium sp.: Superficially resemble Drechslera, bipolaris and exserohilum spores but the mechanism of sporulation is quite different. The taxonomy of this entire group has been widely debated. The antigen labeled “Helminthosporium” in use by allergists for skin testing has been neither Drechslera or bipolaris. No cases of infection caused by true Helminthosporium have been reported in humans or animals. No information is available regarding toxicity. Allergenicity has not been studied, although cross reactivity may exist between all the above-mentioned genera. Natural habitat includes dead stems of herbaceous plants, and twigs and branches of many different kinds of tress. Helminthosporium solani is the cause of “silver scarf” disease in potatoes.

Histoplasma sp.: A fungus that has filamentous growth at 25 degrees C and yeast growth at 37 degrees C. It is reported to be a human pathogen. It may be associated with birds.

Humicuola: Grow on products with a high cellulose content. These fungi are also found in soil and on plant debris.

Hyaline Mycelia: Sterile mycelia that is white or transparent. No fruiting structures are produced by the mycelia. Visual identification of these organism is not possible. Often associated with allergic symptoms.

Hyalodendron sp.: Appear to be common during certain periods of the year. They are morphologically related to Cladosporium but do not have the olive and brown pigments of Cladosporium. No information regarding health effects, toxicity, or allergenicity is available. May be identified on surfaces by tape lifts, tease mounts from bulk samples and in air by culturable samples. Spores look very close to Cladosporium and would most probably be thought of as “young” undigested Cladosporium spores on spore trap samples. Natural habitat is most probably woody plant materials.

Hyphal-like fragments: Filamentous. Branched structures with cell walls.

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