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Willeya diffractella (Nyl.) Müll. Arg.   (redirected from: Staurothele tenuissima Degel.)
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Family: Verrucariaceae
[Endocarpon diffractellum (Nyl.) Gueidan & Cl. Roux, moreEndocarpon tenuissimum (Degel.) Lendemer & Tripp, Polyblastia diffractella (Nyl.) Trevis., Staurothele diffractella (Nyl.) Tuck., Staurothele diffractella var. diffractella (Nyl.) Tuck., Staurothele tenuissima Degel., Verrucaria diffractella Nyl.]
Willeya diffractella image
Stephen Sharnoff  
  • Lichens of North America
  • Web Links
Brodo IM, Sharnoff SD, Sharnoff S. Lichens of North America. New Haven: Yale University Press; 2001.

Thallus pale brown to pale grayish brown, usually continuous, rimose-areolate, and rather smooth.  Pertihecia embedded in thallus except for the conspicuous black summits that are visible at the surface as black dots with a clearly indented ostiole; involucrellum spreading and distinct from exciple (as shown in Fig. 17a); abundant algal cells (usually spherical) in the hymenial cavity; spores colorless, (4-)8 per ascus, 15-28 X 9-12 µm.  HABITAT: Typically on lime-containing rocks, but sometimes on gneiss or even granite; usually in shaded habitats.  COMMENTS:  This is by far the most common 8-spored Staurothele, but the spores are often hard to count because finding a full ascus is not easy.  Look for immature asci with small, developing spores.

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Willeya diffractella
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Willeya diffractella image
Sheila Strawn  
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Robert Klips  
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394