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PRODUCTION Of NUTRIENT SOURCES FOR RHIZOBIUM

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Ustilaginales (Oberwinkler, 1987). However, yeast states of many of these groups of organisms rarely<br />

isolated in nature, i.e., other than from the basidiocarps.<br />

Fungi that form short hyphal fragments or cellular aggregates are frequently referred to<br />

as yeastlike, e.g., species of Trichosporon Behrend. It should be stressed, however, that the<br />

distinctions among the various morphs (unicellular, yeastlike and pseudohyphal) are no always clear.<br />

Yeast/hyphal dimorphism which occurs in many groups of Heterobasidiomycetes, seems to be an<br />

important texonomic feature. This monograph includes only a small number of those taxa in which<br />

obligatory and stable yeast states occur in the normal course of the life history. The classification<br />

system used for basidiomycetous taxa is given in Table 4.<br />

Table 4. Summary of basidiomycetous yeast groups.<br />

Characteristic Characteristic<br />

Order Order<br />

Family Family<br />

Genus Genus<br />

Telemorphic taxa Microstromaceae<br />

I. With “simple” septal pores Microstroma<br />

A. Basidia cylindric, transversely septate<br />

Exobasidiales<br />

Ustilaginales<br />

Exobasidiaceae<br />

Ustilaginaceae Brachybasidium<br />

Microbotryum Dicellomyces<br />

Schizonella Exobasidiellum<br />

Sorosporium Exobasidium<br />

Sphacelotheca Laurobasidium<br />

Sporisorium II. With dolipore septa, parenthesomes cupulate<br />

Ustilago A. Basidia “cruciate-septate<br />

Ustilentyloma and probably with Ustilago-type basidiaa Tremellales<br />

Sporidiales Sirobasidiaceae<br />

Sporidiobolaceae Fibulibasidium<br />

Leacosporidium Sirobasidium<br />

Rhodosporidium Tremellaceae<br />

Sporidiobolus Bulleromyces<br />

?Erythrobasidium Itersoniliae ?Kondoa Holtermannia<br />

?Sakaguchia Phyllogloea<br />

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