6. Staurothele ] 1. VERRUCARIACEAE 35 



1. Thelidiella blastenicola Fink; Hedrick, Mycologia 25:305. 1933. 



Thallus immersed and invisible; perithecia very minute, 0.06-0.09 mm. across, 

 dimidiate and partly immersed, black, seated 1-several on single squamules or 

 apothecia, the superficial portion hemispherical to obscurely subconical, the ostiole 

 only very rarely and tardily visible; spores ellipsoid-dactyloid, the upper cell 

 larger, becoming slightly constricted, 9-11 X 3-4 /x, irregularly arranged. 



On the thallus and the apothecia of Blastema novomexicana, near Los Vegas, 

 New Mexico. 



5. Polyblastia Lonnr., Flora 41:630. 1858. 



Thallus crustose, smooth to chinky, powdery or minutely granulose, sometimes 

 seated upon a well-developed hypothallus, partly within the substratum, devoid of 

 differentiation into layers; perithecia minute to small, more or less immersed, the 

 wall dimidiate or complete, the superficial portion convex to hemispherical or 

 conical, the ostiole minute, rarely visible; hypothecium hyaline; hymenium hyaline 

 or brownish above; paraphyses soon becoming gelatinized; asci broadly clavate; 

 spores 1-8, hyaline to faintly brownish, ovoid to ovoid-ellipsoid or oblong-ellipsoid, 

 transversely and longitudinally septate. 



The algal host is Protococcus. 

 A. On rocks; thallus greenish gray to brownish 



B. Spores 26-34 X 13-17 fi 1. P. intercedens 



B. Spores smaller, 18-24 X 8-12 p. ... .1. P. intercedens aethioboloides 

 A. On moss; thallus whitish 2. P.bryophila 



1. Polyblastia intercedens (Nyl.) Lonnr., Flora 41:631. 1858. 



Verrncaria intercedens Nyl., Mem. Soc. Acad. Maine et Loire 4:33. 1858. 



Thallus thin, smooth to faintly chinky, greenish gray to brownish; perithecia 

 minute to small, 0.25-0.5 mm. across, the wall dimidiate, the superficial portion 

 subhemispherical to conical, black, the ostiole minute, deeply depressed, and rarely 

 visible; spores 2, hyaline to pale brownish, ovoid-ellipsoid, 5-8-septate trans- 

 versely and 3-5-septate longitudinally, 26-34 X 13-17 /x, irregularly arranged. 



On rocks, California, 

 var. aethioboloides (Nyl.) Hasse, Cont. U.S. Nat. Herb. 17:6. 1913. 



Verrucaria intercedens var. aethioboloides Nyl., Not. Sallsk. Faun. Flor. Fenn. 

 1:235. 1859. 



Thallus very thin, subdeterminate; spores smaller, 18-24 X 8-12 p.. 



On rocks, southern California. Doubtfully included as the only specimen seen 

 did not show the smaller spores. 



2. Polyblastia bryophila Lonnr., Flora 41:631. 1858. 



Verrucaria bryophila (Lonnr.) Nyl. 



Thallus thin, whitish, minutely granulose or crumbling and disappearing; peri- 

 thecia minute, 0.1-0.3 mm. across, partly immersed, the superficial portion strongly 

 convex, black, the ostiole scarcely visible; spores 8, hyaline, ovoid, 5-7-septate 

 transversely and 3-5-septate longitudinally, 18-36 X 12-18 /x, finally irregularly 

 arranged. 



On mosses, Maine. 



OTHER SPECIES REPORTED 

 Polyblastia gelatinosa (Ach.) T. Fries — New Hampshire. 

 Polyblastia Henscheliana (Koerb.) Lonnr. — North America. 



6. Staurothele Norm., Nyt. Mag. Nat. 7:240. 1853. 



Thallus crustose, smooth to granulose, warty, or chinky-areolate, sometimes 

 seated upon an indistinct hypothallus, partly within the substratum, devoid of 

 differentiation into layers; perithecia minute to small or middle-sized, more or less 

 immersed in raised areas, indicated by the protruding apex or the minute ostiole, 

 the wall complete; hypothecium hyaline to brownish; hymenium hyaline; paraph- 



