Belongs within: Microbotryomycetes.
The Microbotryales are a group of smut fungi, previously classified with the other smuts in the Ustilaginomycetes but now recognised as a convergent subgroup of the Urediniomycetes.
Characters (from Bauer et al. 2001): Intercellular parasitic hyphae or haustoria only; cellular interactions without primary interactive vesicles; type A 5S rRNA secondary structure; mannose as the major cell wall carbohydrate. Yeast cells ellipsoidal, showing yeast growth only.
<==Microbotryales [Ustilentylomataceae] | i. s.: Bauerago Vánky 1999KC01 |--Fulvisporium Vánky 1997SG03, KC01 | `--F. restifaciensSG03 `--+--Aurantiosporium Piepenbr., Vánky & Oberw. 1996SG03, KC01 | `--A. subnitensSG03 `--+--+--‘Rhodotorula’ hordeaSG03 | `--Ustilentyloma Savile 1964SB03, KC01 | `--U. fluitansSG03 `--MicrobotryaceaeV02 | i. s.: Zundeliomyces Vánky 1987KC01 |--Liroa Cif. 1933SG03, KC01 | `--L. emodensisSG03 `--+--Sphacelotheca de Bary 1884SG03, KC01 | `--S. polygoni-persicariaeSG03 `--Microbotryum Lév. 1847SG03, KC01 [incl. Bauhinus Moore 1992KC01] |--+--M. cordaeSG03 | `--M. reticulatumSG03 `--+--M. violaceumSG03 `--+--M. silenes-inflataeSG03 `--M. violaceo-irregulareSG03
*Type species of generic name indicated
References
Bauer, R., D. Begerow, F. Oberwinkler, M. Piepenbring & M. L. Berbee. 2001. Ustilaginomycetes. In: McLaughlin, D. J., E. G. McLaughlin & P. A. Lemke (eds) The Mycota vol. 7. Systematics and Evolution. Part B pp. 57–84. Springer.
[KC01] Kirk, P. M., P. F. Cannon, J. C. David & J. A. Stalpers. 2001. Ainsworth & Bisby’s Dictionary of the Fungi 9th ed. CAB International: Wallingford (UK).
[SG03] Sampaio, J. P., M. Gadanho, R. Bauer & M. Weiss. 2003. Taxonomic studies in the Microbotryomycetidae: Leucosporidium golubevii sp. nov., Leucosporidiella gen. nov. and the new orders Leucosporidiales and Sporidiobolales. Mycological Progress 2 (1): 53–68.
[V02] Vánky, K. 2002. The smut fungi of the world. a survey. Acta Microbiologica et Immunologica Hungarica 49 (2–3): 163–175.