分离自西藏的两个散囊菌新种

本文报道两个新种:粪生散囊菌(Eurotium fimicola)和旱生散囊菌(Eurotium aridicola),它们不同于已报道的该属诸种。

TWO NEW SPECIES OF EUROTIUM ISOLATED FROM XIZANG (TIBET), CHINA

This paper reports two new species of Eurotium Link.1.Eurotium fimicola sp. nov.: Colonies on Czapeck's agar attaining a diameter of 6-12 mm after 18 days, conidial structures and cleistothecia limited.Colonies on W40S (wart agar with 20 % sucrose) growing radidly, attaining a diameter of 70-75mm in 16 days at 25℃, conidial structures sparse, with surfaces appearing floccose, reaching a highness of 4-5mm, nearly Smoke Gray (Ridgway PI XLVI); cleistothecia more concentrated in the central areas; no exudate; odour slightly mouldy; reverse orange yellow. Cleistothecia globose or subglobose, 90 - 150μm in diameter, nearly Orange Rufous, Burnt Sienna or Chestnut (Ridgway, PI. II);, asci globose to subglobose, 10-13μm in diameter, maturity in about 21 days; asco-spores lenticular, mostly 5.5-6.5 (- 8.0) × 3.5-5.0μm, rouphening all convex surfaces, showing irregularly prominences, with 2 equatorial crests, often showing a prominent band in the equatorial furrow. Conidial heads radiate, 80-120μm in diameter; conidiophores arising from aerial hyphae, stipes 200-500( - 900) × (6.5 -) 8.0-12μm, smooth-walled; vesicles globose, subglobose or flask-shaped, (10 -) 15 28(-32)μm in diameter, fertile all over or on the upper half only; Phialides 9.0-12 × 3.5-5.0μm; conidia globose to [ellipsoidal, 5.5-10 × 4.8-6.4μm, smooth or roughened.No growth at 37℃.This species is closely related to Eurotium cristatum and E. intermedium, but it can be easily distinguished from the latter by its larger conidia, ascospores and more osmophilic ability.The specific epithet refers to the substratum isolated. This species was isolated from animal dung in Xizang (Tibet), China. The type specimen HMAS 62769 and living culture AS 3.4674 are deposited in the Institute of Microbiology, Academia. Sinica, Beijing, China.2.Eurotium aridicola sp. nov.: Colonies on Czapeck's agar no germination of spores in 12 day at 25℃, attaining a diameter of 5-10mm in 30 days, conidial structures and cleistothecia limited.Colonies on W40S growing rapidly, attaining a diameter of 50-60mm in 10 days, at 25℃; more conidial structures in the marginal or near marginal areas, with surfaces appearing loosely floccose, nearly Mineral Gray (Ridgway, PI. XLVII); Cleistothecia more concentrated in the central areas, no exudate; odour lacking; reverse yel- low in the central areas, light gray in the other areas. Cleistothecia globose to su-bglobose, (60 -) 70-90μm in diameter, nearly Aniline Yellow (Ridgway, P1. IV); asci globose to subglobose, 11 -13μm in diameter, maturity in about 14 days; asco-spores lenticular, 5.5-6.5 × 4.0-5.0μm, convex surfaces smooth or nearly so, with 2 equatorial crests, about 0.5-0.8μm broad, often showing a prominent band in the equatorial furrow. Conidial heads appearing radiate, 80-130μm in diameter; coni-diophores arising from substratum or aerial hyphae, stipes (50 -) 150-400 × 8.0-14 (-16)μm, smooth-walled; vesicles globose to subglobose, flask shaped, (10 -) 16-30μm in diameter, fertile all over or on the upper half only; phialides 9.5-12 ( - 14) × 4.0- 5.5 (-6.5)μm; conidia globose to subglobose, 5.0-8.0 ( - 10)μm, less commonly ellipsoidal or oval, 6.5-10 (-12) × 5.5-8.0μm, echinulate.Growth well at 37℃.This species shows some similarities to Eurotium chevalieri. However, it can be easily destinguished from the latter by its more osmophilic ability, larger conidia and ascospores.The species epithet refers to the character of its osmophilic ability of the fungus.This fungus was isolated from sheep dung in Xizang, China. The type specimen HMAS 62768 and living culture AS 3.4673 are deposited in the Institute of Microbiology, Academia Sinica, Beijing, China.