VERRUCARIACEAE 39 



x. Algae Sirosiphon or Scytonema 



Eolichen 76 

 y. Algae Nostoc Pyrenocollema 169 



(c) Spores filiform, continuous Hassea 76 



b. Asci many-spored ; spores i-celled Placothelium 77 



2. Algae yellow green, Pleurococcus, Palmella, Chroolepus, etc. 

 a. Thallus crustose or gelatinous 



(1) Thallus gelatinous, hyphae loose Epigloea 53 



(2) Thallus crustose, not gelatinous, hyphae compact 



(a) Algae Cystococcus, in sheathed colonies 



Subfamily Moriolae 52 

 x. Thallus without pseudoparenchyma 



Moriola 52 

 y. Thallus with pseudoparenchyma 

 (x) Asci 8-spored 

 m. Spores dark, i-septate *Dimerisma 52 



n. Spores dark, 4-8-septate *Phaeomeris 52 



o. Spores hyaline, 2-4-septate Spheconisca 52 

 (y) Asci many-spored ; spores hyaline, i-celled 



*Pleophalis 52 



(b) Algae Pleurococcus or Palmella 



Subfamily Verrucariae 53 

 x. Paraphyses lacking, or soon disappearing 

 (x) Asci 1-8-spored 

 m. Algae present within the perithecium ; spores murif orm 

 (m) Spores hyaline *Phalostauris 57 



(n) Spores dark Staurothele 56 



n. Algae lacking in perithecium 

 (m) Spores i-celled 



r. Spores globose to elliptic 



(r) Perithecia more or less superficial 

 h. Spores hyaline Verrucaria 54 



i. Spores dark *Phaeosporis 55 



(s) Perithecia immersed 



*Lithoecis 55 

 s. Spores vermiform, clavate at each end 



Saccopyrenia 54 

 (n) Spores 2-4-celled, hyaline 



r. Spores 2-celled Thelidium 56 



s. Spores 4-celled *Phragmothele 56 



(o) Spores muriform Polyblastia 56 



(y) Asci many-spored Trimmatothele 56 



y. Paraphyses persistent 



(x) Algae present in the perithecium 



Thelenidia 57 

 (y) Hymenial algae lacking 



m. Perithecia with normal ostiole 



