Apothecia 1-3 mm diam., scattered to crowded on decayed twigs of broad-leaved trees, superficial, short-stipitate, globose when young, opening to cupulate, and finally planate at maturity, covered externally with pale buff to white hairs at the margin and pale buff to brown hairs on the lower portion. Margin incurved and often irregular when dried. Hairs without resin-like materials at the tips. Disc yellow to orange. Stipe central, stout, cylindrical, clothed with hairs or glabrous and with a brown-black base. Hairs up to 180 μm long, mostly 88-128 × 3.2-4.0 μm, cylindrical or slightly tapered near the tip, obtuse, flexuous, multiseptate, forming cells mostly 11-21 μm, with tightly adhering granulate, hyaline to ochraceous with transmitted light. Subhymenium of interwoven septate hyphae. Medullary excipulum of textura intricata or textura angularis. Ectal excipulum of hyaline textura prismatica. Asci 60-104 × 5.0-9.0 μm (ave.= 83.1 × 6.9 μm) clavate, with tapered base, conical apex, 8-spored, J+. Ascospores 47-58(-63) × 2.0-2.8 μm, cylindrical, tapered toward the distal end, usually slightly curved or flexuous, commonly 5-7 septate at maturity, guttulate, hyaline, thin-walled. Paraphyses 1.6-2.4 μm at the widest point, narrowly lanceolate, without septa, commonly exceeding the asci by ca. 15 μm , straight, unbranched, hyaline.
Specimens：
Taiwan, Chiayi: Nanshi Forest Road, alt. 1750 m, on dead twigs, 3 May 1994, WAN028 (TNM F1916). Hsinchu: Sumakussushan, alt. 1600 m, 24 May 1994, WAN042 (TNM F2116). Ilan: Fushan Botanical Garden, alt. 750 m, on rotten twigs, 24 Mar. 1994, Wu94-F2-Ⅱ-T1 (TMTC). Meifeng, alt. 2100 m, on dead trunk of angiosperm, 12 June 1995, WAN116 (TNM F3073). Pilu, alt. 2100 m, on rotten wood, 12 Apr. 1993, 93041423 (TNM F0569).
Habitat：
Lignicolous. On dead twigs or rotton wood of angiosperm.
Distribution：
Argentina, Australia, Brazil, Bolivia, Colombia, Costa Rica, Ecuador, Guadeloupe, India, Jamaica, Japan, Java, Mainland China, Malaya, Mexico, New Guinea, New Zealand, Panama, Peru, Puerto Rico, Rwanda, Singapore, Taiwan and Venezuela.
References：
Wu, ML et al., 1998; Haines, JH and Dumont, KP., 1984.
Provided：
M. L. Wu
Note：
Lachnum abnorme was previously reported from Taiwan as L. abnormis after Haines and Dumont (1984) from a single collection (Wu94-F2-Ⅱ-T1). The latin spelling was later corrected to L. abnorme by Haines in 1992.
Phylum：Ascomycota >> Class： Ascomycetes >> Order： Helotiales 
BCRC Number：