Farysia Racib.

Type

Farysia javanica Racib. on Carex rafflesiana Boott.

Synonyms

Elateromyces Bubák

Description

Sori in single flowers of Cyperaceae, bursting at maturity and forming olivaceous brown to blackish brown dusty or semi-agglutinated spore masses traversed by numerous conspicuous capillitium-like fascicles of sterile hyphae.

Spores solitary, produced in chains by division of the sporogenous hyphae, small, mixed with fascicles of sterile hyphae which function as elaters.

Spore germination resulting in a short basidium on which several cylindrical or spindle-shaped basidiospores are formed.

Host-parasite interaction by intracellular hyphae coated by an electron-opaque matrix.

Septa poreless at maturity.

Comments

There is often great variability in shape and size of the spores within a sorus, thus making species delimitation difficult. A critical world monograph of the genus Farysia is lacking. The genus includes about 20 known species on Carex, with one on Uncinia in South America. Begerow et al. (2006) used DNA molecular analyses to show that species of Anthracoidea, Cintractia, Dermatosorus, Farysia, Heterotolyposporium, Moreaua, Planetella, Schizonella, Stegocintractia, Tolyposporium and Trichocintractia formed a monophyletic clade. They considered that Ustilaginales on Cyperaceae and Juncaceae were best placed in the Anthracoideaceae. However, a comprehensive molecular study towards an internal classification of Ustilaginaceae sensu Bauer et al. (1997) has yet to be carried out (Begerow et al., 2006).

Species in Australia
 
Farysia catenata
Farysia thuemenii

Key based on host taxonomy
 
On Carex1
1.  Empty nut attached to utricle. Spores regular, 6-9.5(-10.5) µm longFarysia catenata
Empty nut not attached to utricle. Spores variable, 3-12 µm longFarysia thuemenii