Rikkinen Jouko, Poinar George O
Department of Biological and Environmental Sciences, PO Box 65, University of Helsinki, FIN-00014 Helsinki, Finland.
J Exp Bot. 2008;59(5):1007-11. doi: 10.1093/jxb/ern004. Epub 2008 Mar 3.
Phyllopsora dominicanus sp. nov. (Bacidiaceae, Lecanorales, lichen-forming Ascomycota) is described and illustrated from Dominican amber. The diagnostic features of the lichen include a minute subfolious thallus of lacinulate, ascending squamules, a well-developed upper cortex, and a net-like pseudocortex on the lower surface. The algal symbionts are unicellular green algae, forming a distinct layer immediately below the upper cortex. The fossil demonstrates that distinguishing features of Phyllopsora have remained unchanged for tens of millions of years. The fossil also provides the first detailed views of mycobiont-photobiont contacts in Tertiary green algal lichens. The mycobiont hyphae formed apical and intercalary appressoria by pressing closely against the photobiont cells. This indicates that a conserved maintenance of structure is also seen in the fine details of the fungal-algal interface.
多米尼加叶盘衣（Phyllopsora dominicanus sp. nov.）（盘菌科，茶渍目，地衣型子囊菌）是从多米尼加琥珀中描述和图示的。该地衣的诊断特征包括微小的亚叶状地衣体，由具细裂片、向上的鳞片组成，有发育良好的上皮层，以及下表面的网状假皮层。藻类共生体是单细胞绿藻，在上皮层正下方形成一个明显的层。该化石表明叶盘衣的显著特征在数千万年里一直未变。该化石还首次详细展示了第三纪绿藻地衣中菌共生体与光共生体的接触情况。菌共生体菌丝通过紧密挤压光共生体细胞形成顶端和居间附着胞。这表明在真菌 - 藻类界面的细微细节中也能看到结构的保守维持。
