The Microascales are an order of fungi in the class Sordariomycetes, subclass Hypocreomycetidae. This is a relatively small order of mostly saprobic fungi that live in soil, rotting vegetation and dung. Some species are plant pathogens, such as Ceratocystis fimbriata, transmitted by beetles to living trees and causing cacao wilt and many other economically important diseases. Species in the genus Pseudallescheria (family Microascaceae) are pathogenic to humans, for example, Pseudallescheria boydii can cause allergic bronchopulmonary disease.[3] The order was circumscribed in 1980.[4]

Thielaviopsis basicola 1.JPG
Thielaviopsis basicola
Scientific classification e
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Subclass: Hypocreomycetidae
Order: Microascales
Luttr. ex Benny & Kimbr. (1980)
  • Halosphaeriales Kohlm. (1986)[2]


The Microascales are characterized by a lack of stroma, black perithecial ascomata with long necks or rarely with cleistothecial ascomata that lack paraphyses. They have roughly spherical and short-lived asci that develop singly or in chains. Nonseptate, colorless ascospores often have ornamenting ridges or wings. The anamorphs of the family Microascaceae produce percurrently proliferating conidiogenous cells (annellides) and sometimes chlamydospore-like or aleurioconidial synanamorphs; these are classified mostly in the genera Scopulariopsis, Graphium and Scedosporium.[5]


  1. ^ "Microascales Luttr. ex Benny & Kimbr. 1980". MycoBank. International Mycological Association. Retrieved 2011-11-30.
  2. ^ Hawksworth DL, Eriksson OE (1986). "The names of accepted orders of Ascomycetes". Systema Ascomycetum. 5: 175–184.
  3. ^ Lake FR, Tribe AE, McAleer R, Froudist J, Thompson PJ (1990). "Mixed allergic bronchopulmonary fungal disease due to Pseudallescheria boydii and Aspergillus". Thorax. 45 (6): 489–491. doi:10.1136/thx.45.6.489. PMC 462540. PMID 2392795.
  4. ^ Benny GL, Kimbrough JW (1980). "A synopsis of the orders and families of Plectomycetes with keys to genera". Mycotaxon. 12 (1): 1–91 (see p. 40).
  5. ^ Abbott SP, Sigler L, Currah RS (1998). "Microascus brevicaulis sp. nov., the teleomorph of Scopuariopsis brevicaulis, supports placement of Scopulariopsis with the Microascaceae". Mycologia. 90 (2): 297–302. doi:10.2307/3761306. JSTOR 3761306.