A Text-Book of General Lichenology, With Descriptions And Figures of the Genera Occurring in the Northeastern United States
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Lich. Univ. 151. 1810.
This genus of lichens is so little understood that it is practically impossible to give its limitations, most of its representatives being included by authors in other lichen-genera. The following are the generic characters as far as they can be determined.
The thallus is crustaceous in the majority of species ; in the higher forms it consists of minute foliose lobes with upper and lower cortical layers. In the majority of species it is usually quite dark, above and below.... The algae are apparently Cystococcus humicola in all the species examined ; incidentally Polycoccus -punctiformis 140 and several other species of algae occur in and upon the thallus, espec- ially in the lower forms. The apothecia are discoid, from minute to medium in size, with a flattened disk ; the epithecium and upper ends of the simple paraphyses are dark ; the hypothecium is non-cortical and usually colorless ; the spores are quite large, multilocular, oblong-el- liptical or nearly spindle-shaped and usually colorless.
What to read after A Text-Book of General Lichenology, With Descriptions And Figures of the Genera Occurring in the Northeastern United States?
You can find similar books in the "Read Also" column, or choose other free books by Albert Schneider to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Lich. Univ. 151. 1810.
This genus of lichens is so little understood that it is practically impossible to give its limitations, most of its representatives being included by authors in other lichen-genera. The following are the generic characters as far as they can be determined.
The thallus is crustaceous in the majority of species ; in the higher forms it consists of minute foliose lobes with upper and lower cortical layers. In the majority of species it is usually quite dark, above and below.... The algae are apparently Cystococcus humicola in all the species examined ; incidentally Polycoccus -punctiformis 140 and several other species of algae occur in and upon the thallus, espec- ially in the lower forms. The apothecia are discoid, from minute to medium in size, with a flattened disk ; the epithecium and upper ends of the simple paraphyses are dark ; the hypothecium is non-cortical and usually colorless ; the spores are quite large, multilocular, oblong-el- liptical or nearly spindle-shaped and usually colorless.
What to read after A Text-Book of General Lichenology, With Descriptions And Figures of the Genera Occurring in the Northeastern United States?
You can find similar books in the "Read Also" column, or choose other free books by Albert Schneider to read onlineMoreLess
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