Diaporthe arecae (H. C. Srivast., Zakia & Govindar.) R. R. Gomes, Glienke & Crous, Persoonia 31: 16 (2013)

Fig. 7

Description.

Conidiomata pycnidial, aggregated or solitary, erumpent, subglobose, black, 300–1200 μm diam., exuding white conidial masses. Conidiophores indistinct, usually reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, cylindrical to ampulliform, attenuate towards the apex, phialidic, 10.5–28.5 × 1.5–3.5 μm. Alpha conidia aseptate, hyaline, smooth, multi-guttulate, fusoid, straight or slightly curved, base truncate, (5.5 –) 6.5–8.5 (– 9.5) × 2–2.5 (– 3) μm (n = 50), L / W = 2.2–4.6. Beta conidia aseptate, hyaline, smooth, guttulate or not, filiform, curved or not, (12 –) 13.5–19.5 (– 24.5) × 1.5–2 μm (n = 50), L / W = 5.7–15.5.

Culture characteristics.

Colonies on PDA flat, spreading, flocculent, with entire edge, white to mouse grey, reaching 25 mm in diam. after 10 days at 25 ° C; colonies on MPA flat, spreading, flocculent, with entire edge, white, reaching 25 mm in diam. after 10 days at 25 ° C, forming black conidiomata with off-white masses; colonies on SNA flat, with sparse aerial mycelium and entire margin, white, reaching 25 mm in diam. after 20 days at 25 ° C.

Distribution.

Worldwide.

Ecology.

Associated with leaf spot, branch canker and fruit rot diseases on various hosts, including Citrus sp., Cyclobalanopsis glauca, Musa sp., Pterocarpus indicus, Senna bicapsularis, Subramanella arecae, etc.

Materials examined.

CHINA • Hainan Province, Changjiang Li Autonomous County, Bawangling National Forest Park, on diseased leaves of Cyclobalanopsis glauca, 30 March 2019, Yong Li (culture CFCC 55899).

Notes.

Diaporthe arecae was recently circumscribed based on a combination of phylogenetic analysis, GCPSR, and coalescence-based models (Dissanayake et al. 2024). In the current study, isolate CFCC 55899 clustered with the ex-type strain of D. arecae (CBS 161.64) in the multi-locus phylogeny (Fig. 1). To our knowledge, this is the first report of D. arecae causing leaf spots on Cyclobalanopsis glauca in China.