1986年牧草病害调查中在云南省昆明小哨畜牧场发现黑麦草严重发生一种新病害—假黑穗病。该场黑麦草种子是由澳大利亚进口的.病株穗部多数子粒变成黑色角状物,由颖壳中伸出,大小为5～8×2毫米,表面粗糙,有粉质感,与黄穗病菌瘿极为相似。用手捐压迫后易破碎,但不散出黑粉状物。经鉴定,此种角状物本体为麦角菌(ClavicePs purpurea(Fr.)Tui.]的菌核,但为须芒草茬孢(Cerebella andropogonis Ces.)所寄生,使之变为分生孢子座。在高倍扩大镜或实体显微镜下观察,可清楚地显示出予座有不规则的迥沟,盘旅如脑状,其表面密生分生孢梗和分生孢子.据此可与黑粉菌菌瘿相区分.须芒草花孢的分生孢予梗短而直,表面光滑,常有分枝.分生孢予顶生,球形,近球形,表面有微疣,暗褐色。孢予有纵。横或斜向隔膜,分成1～8个细胞。云南的标本多数为3胞(占39.5%)或4胞(占27.0%),隔膜处有缢缩。孢予大小为10～27.5×12.5～30微米(平均18.9×22.2微米).成熟孢予 In a 1986 survey of foraging diseases, a new disease was found in ryegrass at the Little Whistler Ranch in Kunming, Yunnan Province - a false smut. The field of ryegrass seeds are imported from Australia. Most of the diseased panicles become black horns, protruding from the glume shell, the size of 5 ~ 8 × 2 mm, the surface is rough, silky texture, and Huang Sui Pathogen 瘿 very similar. After the hand pressure is easy to crush, but does not shed black powder. It has been identified that the body of this horn is the sclerotium of Claviceps purpurea (Fr.) Tui.] But is parasitic to Cerebella andropogonis Ces. To become a conidia. Observation under high magnification magnifying glass or solid microscope can clearly show that there is an irregular ditch on the seat, such as cerebrospinal disk, conidiophore and conidia on its surface,瘿 phase distinction .Ceniformis spores to the stem short and straight, smooth, often branched.Some spores to the top students, spherical, nearly spherical, the surface of a wart, dark brown spore to have vertical Transverse or oblique diaphragm, divided into 1 to 8. Cells in Yunnan majority of 3 cells (39.5%) or 4 cells (27.0%), diaphragm shrinkage spore to the size of 10 ~ 27.5 × 12.5 ~ 30 microns (average 18.9 x 22.2 microns)