Revisions of Some Plant Phyla IS 



nidia, rarely with Pleurococcus gonidia; apothecia superficial or 

 marginal. Pannaria, Psoroma, Coccocarpia. (Pf. I, i*, 178.) 



Family 21. Stictaceae. Foliose lichens with Palmella or Nos- 

 toc gonidia; apothecia superficial or marginal, sessile or shield- 

 shaped. Loharia, Sticta. (Pf. I, i*, 185.) 



Family 22. Peltigeraceae. Foliose lichens with Palmella or 

 Nostoc gonidia; apothecia flat, large, submarginal, dark-colored. 

 Peltigera, Solorina. (Pf. I, i*, 190.) 



Family 23. Pertusariaceae. Crustaceous lichens with Proto- 

 coccus gonidia ; apothecia mostly punctiform, single or clustered 

 in thalline warts. Pertusaria. (Pf. I, i*, 195.) 



Family 24. Lecanoraceae. Crustaceous lichens with Proto- 

 coccus gonidia; apothecia sunken, not margined. Lecanora 

 (Pf. I, I*, 199.) 



Family 25. Parmeliaceae. Foliose lichens with Protococcus 

 gonidia ; apothecia scutellaeform, margined, sunken. Parmelia, 

 Cetraria. (Pf. I, i*, 207.) 



Family 26. Usneaceae. Fruticose lichens, often long and much 

 branched, with Protococcus gonidia ; apothecia terminal or mar- 

 ginal, scutellaeform, often large. Usnea, Ramalina, Evernia. 

 (Pf. I, I*, 216.) 



Family 27. Caloplacaceae. Crustaceous lichens with Pleuro- 

 coccus gonidia ; apothecia at first sunken, later erumpent, spores 

 colorless. Caloplaca. (Pf. I, i*, 226.) 



Family 28. Theloschistaceae. Foliose to fruticose lichens with 

 Pleurococcus gonidia ; apothecia at first sunken, later erumpent, 

 spores colorless. Theloschistes. (Pf. I, i*, 229.) 



Family 29. Buelliaceae. Crustaceous lichens with Protococcus 

 gonidia ; apothecia at first sunken, later erumpent, spores brown. 

 Buellia, Rinodina. (Pf. I, i*, 230.) 



Family 30. Physciaceae. Foliose or fruticose lichens with 

 Protococcus gonidia ; apothecia at first sunken, later erumpent, 

 spores brown. Physcia. (Pf. I, i*, 234.) 



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