Two new species of Lecanora sensu stricto (Lecanoraceae, Ascomycota) from east Africa

The new sorediate species Lecanora kenyana from Mount Kenya and Lecanora orientoafricana from the Rift Valley in Kenya are described. Lecanora kenyana has red-brown apothecia with a constricted base, a melacarpella–type amphithecium, pulicaris–type epihymenium, a hyaline hypothecium, and contains usnic acid as major constituent. Lecanora orientoafricana is characterized by having a dark hypothecium, pulicaris-type amphithecium, chlarotera-epihymenium, and contains atranorin and gangaleoidin. A phylogenetic analysis using maximum likelihood and a Bayesian approach based on DNA sequence data of mtSSU and ITS rDNA support that both new species belong to Lecanora sensu stricto and cluster with species containing usnic acid or having a dark hypothecium, respectively.

本文记述了两个具粉芽的地衣新种：采自肯尼亚山的肯尼亚茶渍（Lecanora kenyana），以及采自肯尼亚东非大裂谷的东非茶渍（Lecanora orientoafricana）。肯尼亚茶渍具有红棕色子囊盘，基部缢缩，具黑果衣型囊层被、普里卡里型子实层上层，子实下层透明，且以松萝酸为主要次生代谢产物。东非茶渍的特征为子实下层深色、普里卡里型囊层被、克拉罗泰拉型子实层上层，且含有阿特拉诺林（atranorin）与gangaleoidin。基于线粒体小亚基核糖体DNA（mtSSU）和内转录间隔区核糖体DNA（ITS rDNA）的序列数据，采用最大似然法与贝叶斯法开展的系统发育分析结果表明，这两个新种均隶属于狭义茶渍属（Lecanora sensu stricto），且分别与含松萝酸的物种以及具深色子实下层的物种聚为一支。