全 文 ：菌 物 学 报 25（2）：161~162, 2006
Mycosystema
Ustilago duriusculae, a new species of Ustilaginaceae (Ustilaginales)
from China
GUO Lin
(Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing
100080, China)
ABSTRACT: A new species, Ustilago duriusculae on Carex duriuscula subsp. rigescens is described.
KEYWORDS: Smut fungi, Ustilaginomycetes, taxonomy
寸草黑粉菌新种（黑粉菌目）
郭 林
（中国科学院微生物研究所真菌地衣系统学重点实验室, 北京 100080）
摘 要：自中国青海民和发现一种寄生在莎草科白颖苔草 Carex duriuscula subsp. rigescens 植物上的黑粉
菌新种，寸草黑粉菌 Ustilago duriusculae。此种与寄生在禾本科植物上的条形黑粉菌（Ustilago striiformis）
近似，其区别是寄生植物属于不同的科。
关键词：黑粉菌，黑粉菌纲，分类学
中图分类号：Q939.5 文献标识码：A 文章编号：1672-6472（2006）02-0161-0162

INTRODUCTION
A smut fungus on the leaves of Carex duriuscula subsp. rigescens was collected in Qinghai Province in
2004. There are several known genera of smut fungi on Carex in the world (Vánky, 2002), e.g. Anthracoidea,
Entorrhiza, Farysia, Moreaua, Orphanomyces, Planetella, Schizonella, Tolyposporium and Urocystis.
MATERIALS AND METHODS
Pressed and dried smutted specimen of Carex duriuscula C.A. Mey subsp. rigescens S.Y. Liang et Y.C.
Tang was studied. For light microscopy (LM), dried ustilospores were rehydrated in a droplet of lactophenol by
gently heating to boiling point under a coverslip. For scanning electron microscopy (SEM), dried ustilospores
were dusted on double-sided adhesive tape, fixed on specimen stubs, sputter coated with gold, ca. 20 nm and
studied with a FEI Quanta 200. The specimen examined is deposited in the Mycological Herbarium, Institute of
Microbiology, Chinese Academy of Sciences (HMAS) and Herbarium Ustilaginales Vánky (HUV).
RESULTS AND DISCUSSION
Sori in the leaves of Carex duriuscula subsp. rigescens form longitudinal striae between the veins, ca.
3-7.5 cm long and 0.2-0.3 mm wide. At first they are covered by the epidermis which later ruptures to expose
the ustilospores and the leaves are splitting. The ustilospores are single, not in pairs or in balls. Single
ustilospores occur in species of Anthracoidea, Entorrhiza, Farysia, Orphanomyces and Planetella. The present

Supported by the National Natural Science Foundation of China (国家自然科学基金 No. 30230020 and No. 30270016)
收原稿日期：2005-12-27，收修改稿日期：2006-03-24
DOI:10.13346/j.mycosystema.2006.02.001
162 菌 物 学 报 25 卷
smut is quite different from these genera. It is close to Ustilago striiformis (Westend.) Niessl on Poaceae from
which it differs in parasitizing different host family.
Ustilago duriusculae L. Guo, sp. nov. (Ustilaginaceae) Figs. 1-3
Sori in foliis, primo epidermide obtecti, deinde nudi. Massa sporarum nigrobrunnea, pulverulenta.
Ustilosporae subglobosae, ellipsoideae, ovoideae vel parum irregulares, 8-15 x 7.5-12 μm, rubrobrunneae vel
flavidobrunneae; pariete ca. 1 μm crasso, echinulato.
Sori in leaves, at first covered by the epidermis, which later ruptures. Spore mass blackish-brown, powdery.
Ustilospores subglobose, ellipsoidal, ovoid, or slightly irregular, 8-15 x 7.5-12 μm, reddish-brown or
yellowish-brown; wall ca. 1 μm thick, echinulate.
On Carex duriuscula C.A. Mey subsp. rigescens (Franch.) S.Y. Liang et Y.C. Tang (Cyperaceae), Qinghai:
Minhe, Langtang, alt. ca. 2580 m, 9 VIII 2004, L. Guo & W. Li 2698, HMAS 95452 (holotype designated here),
isotype in Herbarium Ustilaginales Vánky (HUV 20951).
ACKNOWLEDGEMENTS The author would like to express her deep thanks to Dr. Vánky and Prof. Zhuang
Jian-Yun for reading the manuscript and many valuable suggestions, to Prof. Liang Song-Jun (Institute of
Botany, Chinese Academy of Sciences) for identifying the host plant, and to Mr. Zhao Xiao-Ping and Mrs. Xie
Jia-Yi for assistance with LM and SEM photographs.

Fig. 1 Sori of Ustilago duriusculae on Carex duriuscula subsp. rigescens. (HMAS 95452, holotypus). Figs. 2-3. Ustilospores
as seen by LM and SEM (HMAS 95452, holotypus)
[REFERENCE]
Vánky K, 2002. Illustrated Genera of Smut Fungi. (second edition.) APS Press, St. Paul, 1-238.