Colletotrichum sansevieriae Miho Nakam. & Ohzono, in Nakamura, Ohzono, Iwai & Arai, J. Gen. Pl. Path. 72(4): 253 (2006)
Parasitic on living leaves of Sansevieria trifasciata, causing conspicuous, rounded to oval, black, leaf-spots, forming numerous minute fruiting bodies in concentric zones. Sexual morph: undetermined. Asexual morph: Conidiomata 300–350 µm diam., 300–350 µm high, stromatic, acervular, amphigenous, solitary, gregarious or confluent, semi-immersed, subglobose, glabrous, unilocullar, black, thick- and smooth-walled. Conidiomatal wall 70–140 µm wide, composed of thick-walled, dark brown cells of textura globulosa to loose textura epidermoidea in the outer part, merging with brown to pale brown, thick-walled cells of textura porrecta to textura angularis in the inner part. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from the basal regions of stromata, 15–35 × 3–6 µm, hyaline, enteroblastic, phialidic, cylindrical to subcylindrical, determinate, smooth-walled. Conidia 13–23 × 4–7 µm (x= 18 × 5 µm; n = 30), hyaline, ellipsoidal, with rounded ends, sometimes with a narrow and truncate base, straight or slightly curved, thick- and smooth-walled, guttulate.
Culture characteristics: Colonies on PDA, reaching 6–8 cm diam. after 1 week at 25–30 °C, white to brown with age, circular, flattened, dense, slightly cottony, smooth at margins, reverse brown. Sporulation appearing after 4 weeks. Conidiomata formed from mycelium, brown to dark brown, gregarious, globose or subglobose.
Material examined: Thailand, Chiang Rai, on living leaves of Sansevieria trifasciata (Asparagaceae), 10 April 2015, Wen-Jing Li, WJL0035 (MFLU 19-2898), living culture, MFLUCC 15-0579 = ICMP 21855.
Notes: Colletotrichum sansevieriae is host-specific to Sansevieria, causing leaf anthracnose (Nakamura et al. 2006). This species has been reported from Australia, Japan, Korea and USA (Nakamura et al. 2006, Aldaoud et al. 2011, Palmateer et al. 2012, Park et al. 2013, Liu et al. 2014). Our collection MFLUCC 15-0579 clustered with C. sansevieriae with good support (Fig. 83). The conidia dimensions of our collection (13–23 × 4–7 µm) fall into the range of C. sansevieriae (12.5–(18.4)– 32.5 × 3.8–(6.4)–8.8 µm; Nakamura et al. 2006). Based on morphology, phylogeny, habit and host, our collection is identified as a new record of C. sansevieriae from Thailand.
Colletotrichum sansevieriae (MFLU 19-2898) a Herbarium specimen. b, c Appearance of black conidiomata on the host. d Vertical section of conidioma. e, f Vertical sections of peridium. g–i Conidiogenous cells and developing conidia. j–p Conidia. q Germinating conidium. Scale bars: b = 1000 µm. c = 500 µm, d= 100 µm, e–f = 20 µm, g–i = 10 µm, j–p = 5 µm, q = 20 µm, r = 20 mm.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.