148. Phlyctis] 38. LECANORACEAE 315 



var. ochrophaeum (Tuck.) Merrill & Burnh., Bryologist 25:73. 1922. 



Biatora ochrophaea Tuck., Syn. Lich. N. E. 61,62. 1848. 



Thallus thick, smooth to rough, wrinkled and warty, finally crumbling more 

 or less; apothecia substipitate, the disk but slightly convex, the exciple seldom 

 disappearing. 



On trees, distribution as in the species. 



4. Haematomma cismonicum Belts., Lich. Bassam. 127. pi. 4, f. 1-4. 1858. 

 Lecanora elatina var. minor Tuck. 



Thallus very thin, smooth to wrinkled and minutely granulose, pale greenish 

 gray to ashy white; apothecia minute to small, 0.3-0.8 mm. across, sessile, the 

 disk flat to somewhat convex, white-pruinose, or rarely pale brownish, the exciple 

 thin, colored like the thallus, becoming somewhat flexuous and rarely disappearing; 

 spores fusiform-needle-shaped, curved, 3-5-septate, 30-45 X 4-5.5 /x. 



On trees, New England, New York, and North Carolina. 



5. Haematomma coccineum (Dicks.) Koerb., Syst. Lich. 153. 1855. 



Lichen coccineus Dicks., Crypt. Brit. 1:8. 1785. Lecanora haematomma Ach. 



Thallus thin to moderately thick, smooth to powdery, whitish sulphur-colored 

 to whitish; apothecia small to middle-sized, 0.5-1.4 mm. across, adnate, the disk 

 flat to strongly convex, scarlet to reddish brown, the exciple thin, colored like 

 the thallus, becoming subcrenate and disappearing; spores needle-shaped, curved, 

 3-7-septate, 28-60 X 5-7 fx. 



On rocks, Colorado. 



OTHER SPECIES REPORTED 

 Haematomma Rappii Zahlbr. — Florida. 



148. Phlyctis Flot, Bot. Zeit. 8:571. 1850. 



Thallus crustose, smooth to rough, chinky, areolate or powdery, the upper 

 cortex usually wanting, the algal layer indistinct, the medullary layer of loosely 

 interwoven, thin-walled hyphae, attached to the substratum by hyphal rhizoids; 

 apothecia minute to small or middle-sized, immersed to adnate, the disk concave 

 to flat, the exciple colored like the thallus, thin to thick, irregular; hypothecium 

 hyaline to yellowish or brownish; hymenium hyaline or brownish above; paraph- 

 yses unbranched and free or somewhat branched toward the apices; asci clavate; 

 spores 1-8, hyaline, oblong to oblong-ellipsoid or ellipsoid, transversely and longi- 

 tudinally septate. 



The algal host is Pleurococcus. 



A. Spores not more than 90 m in length 1. P.agelaea 



A. Spores more than 90 n in length 



B. Apothecia not more than 0.25 mm. across ... 3. P.Willeyi 



B. Apothecia more than 0.25 mm. across 2. P. argena 



1. Phlyctis agelaea (Ach.) Flot., Bot. Zeit. 8:574. 1850. 



Lichen agelaeus Ach., Lich. Suec. 30. 1798. 



Thallus thin, smooth or becoming obscurely chinky and areolate, white or 

 grayish white; apothecia minute to small, 0.2-0.5 mm. across, the disk flat, black 

 or whitish pruinose, the exciple thin, colored like the thallus, becoming powdery; 

 hypothecium yellowish; spores 1-2, hyaline to pale brownish, oblong-ellipsoid, 

 pointed at both ends, 15-21-septate transversely and 5-9-septate longitudinally, 

 48-85 X 14-20 /x. 



On trees, southern California. 



2. Phlyctis argena (Ach.) Flot., Bot. Zeit. 8:572. 1850. 

 Lichen ar genus Ach., Lich. Suec. 8. 1798. 



Thallus thin, round, smooth to slightly wrinkled, becoming powdery, white 

 throughout or creamy white toward the circumference; apothecia small to middle- 

 sized, 0.25-0.6 mm. across, adnate, the disk flat, brownish black to black or thickly 



