Phylum:Ascomycota >> Class: Ascomycetes >>  Order: Dothideales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Letendraea helminthicola

Letendraea helminthicola (Berk. & Br.) Weese, Centralbl. Bakt., 2. Abt. 42: 588. 1914.

Basionym: Nectria helminthicola Berk. & Br., Ann. Mag. Nat. Hist., ser. 3, 3: 356. 1859.

 Description: Hypostromata subepidermal, crustose, 15-40 μm high, composed of cells forming textura angularis. Ascomata densely gregarious, usually interspersed with conidiophores of Helminthosporium sp., erumpent through epidermis and becoming superficial, subglobose to turbinate, 195-330 μm wide, 210-350 μm high, flattened at base, reddish at first and becoming black with age, rarely collabent when dry, tuberculate, ostiolate, rounded to truncate at apex. Ostiolar canal lined with short periphyses growing downwards. Sterile basal part of the ascoma up to 105 μm high, flattened at the lower end. Peridium 20-25 μm wide, composed of 3-5-layers, brown, polygonal cells, blackened at the outermost layer of cells; peridium around ostiole wider, 30-40 μm wide, of 7-10-layered of cells; tubercles covering the peridium composed of one or two blackened cells. Inner region of peridium composed of loose hyphae forming textura intricate. Fertile part of the ascoma globose, lined with conspicuous subhymenium. Asci basal, peripheral, elliptical, shortly stipitate, 80-100 × 8-10 μm, bitunicate, 8-spored. Pseudoparaphyses rarely branched, septate, 1.5-3 μm wide. Ascospores oblong-fusoid, 12-18 × 4-6 μm, pointed at ends, 1-septate at middle, constricted at the septum, dark brown, uniseriate in ascus.

Taiwan, Nantou County, Piluchi, 22 Dec. 1995, NCHUPP-2408.

 Habitat: Interspersed between Helminthosporium, on dead branches of Cinnamomum sp.

Europe, Taiwan.


Cnen, CY. and Hsieh, WH. 1997; Samuels, G.J. 1972.


W. H. Hsieh

 Note: The ascomata of L. helminthicola are associated with Helminthosporium and may be parasitizing on it (Samuels, 1972). Combination between the two fungi were not found in our material, merely association being observed. Their relationship of parasitism is uncertain, and needs further studies.