New freshwater species of Ascotaiwania and Savoryella from Taiwan

被引:33
作者
Chang, HS
Hsieh, SY
Jones, EBG
Read, SJ
Moss, ST
机构
[1] Univ Portsmouth, Sch Biol Sci, Portsmouth PO1 2DY, Hants, England
[2] Acad Sinica, Inst Bot, Taipei 11529, Taiwan
[3] City Univ Hong Kong, Dept Biol & Chem, Kowloon, Hong Kong
来源
MYCOLOGICAL RESEARCH | 1998年 / 102卷
基金
英国自然环境研究理事会;
关键词
D O I
10.1017/S0953756297005637
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Four new taxa are described, each having multiseptate ascospores with hyaline end cells; Savoryella limnetica, Ascotaiwania wulai, A. hsilio and A. sawada). Savoryella and Ascotaiwania are evaluated and separated by the following characters: Savoryella has broad, up to 2 mu m paraphyses (sparse) that are septate and rounded at their ends, and smaller asci with an apical thickening containing a plugged pore and 3-septate ascospores; Ascotaiwania has narrow, filiform, septate paraphyses up to 2 mu m wide, but these deliquesce early and are rarely observed in mature ascomata. Ascotaiwania also has asci with a well-developed apical ring and plugged pore and ascospores generally with more than 3 septa. Ultrastructural studies of A. lignicola showed that the ascospores are covered by a thin mucilaginous sheath and unitunicate asci with the wall comprising an outer, 30-40 nm electron-dense layer and an inner, 420-450 nm, thick electron-transparent layer. Asci have a well-developed apical apparatus consisting of an electron-dense apical ring with a plug. The plug deliquesces prior to ascospore release. The ascospore wall comprises an electron-dense episporium and a less electron-dense mesosporium. External to the episporium is a fibro-granular sheath.
引用
收藏
页码:709 / 718
页数:10
相关论文
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