Skip to main content


Roccella (order Opegraphales) A genus of lichens, in which the thallus is fruticose, and attached to its substrate by a basal sheath. The ascocarps are apothecioid (see APOTHECIUM) and round or elongated. Spores are colourless and usually triseptate (see SEPTUM). Roccella species are found chiefly on rocks by the sea in warmer regions. Some have been used in the manufacture of certain dyes, including the pH indicator litmus.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Roccella." A Dictionary of Plant Sciences. . 21 Mar. 2019 <>.

"Roccella." A Dictionary of Plant Sciences. . (March 21, 2019).

"Roccella." A Dictionary of Plant Sciences. . Retrieved March 21, 2019 from

Learn more about citation styles

Citation styles gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates. Therefore, it’s best to use citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

The Chicago Manual of Style

American Psychological Association

  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.