Phylum. Dikaryomycota

Sub Phylum. Ascomycotina

Class. Hemiascomycetes:

the one unifying characteristic is that all members have no ascocarp.

Order: Taphrinales

This is an outlying group which causes serious diseases of some plants in the Rosaceae (e.g., Taphrina deformans causing peach leaf curl).

Taphrina deformans:

This fungus attacks peach trees and cause peach leaf curl. It produces an exposed layer of asci (naked asci) on the surface of the host leaf . Since there is no surrounding or supporting fungal tissue, there is nothing we could call an ascoma. 

Symptoms of leaf curl appear in the spring. The leaves become thickened, distorted and often yellow or reddish in colour.

Order: Endomycetales

This order concern us economically because they include the yeast, so important in industry.

Family: Endomycetaceae

Schizosaccharomyces octosporus 

Is an example of a fission unicellular yeast, which also produce asci and eight ascospore. Its better known as the brewer's yeast.

  Family: Saccharomycetaceae

Saccharomyces cerevisiae

(baker's yeast) is probably the most studied species of fungi because of its economic importance in the wine industry. reproducing asexually by budding, and produce four ascospore during sexual phase.

Class: Plectomycetes:

In this class all they have in common is the production of closed ascocarp or cleistothecium.

Order: Erysiphales:

All members of this order are obligate parasites on leaves and fruits of higher plants, causing diseases called powdery mildews because the affected parts have a white, mealy appearance produced by masses of conidiophore.

Erysiphe graminis

The cleistothecia are dark brown, globose, with many unbranched appendages. There are multiple asci within each cleistothecium. This genera causes powdery mildew disease on plants of Graminae.

Uncinula sp.

There are several asci per cleistothecium. The cleistothecia have appendages that may or may not be branched, but always have curved tips. Uncinula sp. causes powdery mildew disease of grape vines.

Podosphaera leucotricha

Cleistothecia of genera contain a single ascus and have flattened, dichotomously branched appendages. causes powdery mildew disease of apple.