26 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
the loculi equal, 16 to 24, long, 3.5 to 4 thick; hymenial gelatine with iodine 
reddish orange to a rich red brown. 
Bark, Santa Catalina Island, Trask; on Lycium californicum, near Newport, Orange 
County; on bark of Quercus agrifolia, in the Santa Monica Range. 
9. Opegrapha umbellulariae Zahlbr. Beih. Bot. Centralbl. 18: 154, 1902. 
Thallus whitish, smooth, continuous to delicately rimose, forming small roundish, 
epiphloeodal patches; apothecia small, black, straight or curved, simple or at times 
forked, linear-ellipsoid; disk rimeform to slightly dilated; epithecium black, car- 
bonaceous; thecium 74 » high; hypothecium pallid; hymenial gelatine with iodine 
blue soon changing to yellow and orange; spores in 8’s, colorless, oblong, the ends 
blunt, 13 to 15 » long by 4 # thick, 4-locular, slightly constricted at points of septation. 
On Umbellularia californica. Type locality, Malibu Canyon, Santa Monica Moun- 
tains. 
Type deposited with Dr. A. Zahlbruckner; duplicate in herb. Hasse. 
CHIODECTONACEAE. 
Thallus crustaceous, uniform, attached to the substrate by hypothalline or medul- 
jary hyphe, ecorticate (in our genera), with Chroolepusgonidia; apothecia in stromata, 
mostly immersed, orbicular or elongate, with a dark or colorless proper margin; 
paraphyses simple, free or branched and reticulate; spores parallel-multilocular, the 
loculi cylindric (in our genera); spermatia cylindric, elongated to elliptic, straight or 
curved. 
KEY TO GENERA. 
Spores colorless. ............. 26.0002 eee ee eee eee eee eee CHIODECTON (p. 26). 
Spores dark............ 22.0200 eee eee SCLEROPHYTON (p. 27). 
CHIODECTON Ach. 
Apothecia variously shaped, from round and oblong to linear and stellate; proper 
exciple well developed, brittle, dark or rudimentary; hypothecium similar to the 
exciple; paraphyses branching, interwoven; spores fusiform to acicular or oblong, 
colorless, parallel-multilocular. 
1. Chiodecton ochroleucum Zahlbr. Bull. Torrey Club 27: 646. 1900. 
“Thallus tenuis, effusus, inaequalis vel subrugulosus, tartareus, ochroleucus, KHO 
flavens, Ca(ClO), erythrinosus, medulla alba. I vinosa fulvescenti. Gonidia chro- 
olepoidea, cellulis ellipsoideis vel oblongis, concatenatis. Pocadostromata thallo 
immersa vel rarius demum modica prominale, irregulariter oblonga, usque 1 mm. 
vel parum ultra longa, niveo-pruinosa. Hymenia stellata, substellata, elongata, vel 
plus minus flexuosa, apicibus obtusis, humectata mollia et turgescentia, ochracea, 
margine diaphana, intus pallida, I vinosa-rubescentia. Hypothecium et epithecium 
pallidum (lutescens). Paraphyses tenues, filiformes, connexo-ramosae. Asci ovali- 
cuneati, 8-spori, 53-62 » longi et 20-22 4 lati. Sporae ovales vel ovali-oblongae, 
hyalinae, transversim 4-5 septatae, cellulis cylindricis, 14-18 » longi et 8 » latae, 
episporio tenui. Receptacula pycnoconidiorum punctiformia, nigra, nitida, immersa, 
excepto vertice; sterigmatibus basi ramosis, cellulis superioribus subinflatis, longi- 
oribus, subfasciculatis; pycnoconidiis filiformibus, arcuatis, 11-18 in diam. et 
1.5-1.8 p latis.” 
“Species distincta, a Chiodectone californica Tuck. hymenio pallido et sporis minori- 
bus latioribusque distat.”’ 
On bark of Rhus integrifolia, Santa Catalina Island, Trask. 
