IQO HERRE 



indigo with I; spores bilocular, oblong, straight or sHghtly curved, 



II — 19 



Rare with us apparently, but probably only overlooked as it is 

 inconspicuous. Growing on bark of Umhellularia calif ornica, with 

 Lecidea tricolor and other lichens. Widely distributed over Europe 

 and North America. 



XLVI. Placolecania (Steiner) A. Zahlbr. 



Placolecania A. Zahlbr. Ascolichenes, 205. 1907. 



A small genus, separated from Lecania by the endobasidial sterig- 

 mata, which are simple or sparingly branched, and septate; sper- 

 matia short, straight, rod-like; spores much as in the preceding genus, 

 2 — 4 locular. 



We have but one species. 



I. PLACOLECANIA CRENATA Herre, new species. 



Thallus of small, orbiculate or erect-imbricate, turgid, crenate and 

 wavy squamules; color pale yellowish-ashy, or yellowish-gray, more 

 or less gray margined; beneath whitish, becoming dusky or blacken- 

 ing; KOH- ; CaClaOa-. 



Apothecia small to barely medium, plane, finally convex, half con- 

 cealed by erect thaUine lobules, or sessile; the entire thick margin 

 becoming crenate or wavy and sometimes excluded; disk pale brown- 

 ish-plum color and blackening, whitish pruinose; paraphyses free, 

 slender, unbranched, their tips thickened and sometimes septate, 

 colorless; epithecium reddish brown or dark; thecium permanent 

 indigo blue with I; hypo thecium colorless or sUghtly brown; spores 



simple to quadrilocular, mostly bilocular, elliptical, — ^ ^ ,«; 



.25 — .5 



spermatia minute, straight, endobasidial, /<• 



I 2.5 



On rocks and earth in crevices, 50 to 100 feet above the sea at 

 Point Lobos, San Francisco. Material scanty and as yet not seen 

 elsewhere. 



Resembles in external appearance Lecidea massata Tuck., but the 

 material in the Tuck. Herb, is so very scanty that I did not use an}^ 



