154 28. COLLEMACEAE [102. Synechoblastus 



pruinose, the algoid exciple thin, sometimes disappearing; hypothecium cloudy; 

 spores fusiform to acicular, 3-7-septate, 40-70 X 3.5-6.5 jx. (Plate 6 b.) 

 On trees, throughout the United States. 



2. Synechoblastus rupestris (Swartz) Trev., Caratt. Gen. Collem. 3. 1853. 

 Lichen rupestris Swartz, Meth. Muscor. 37. 1781. Collema rupestre (Swartz) 



Rabh. Collema flaccidum Ach. S. flaccidus (Ach.) Koerb. 



Transforming the algal colony into a middle-sized, round to irregular, more or 

 less lobed, smooth to minutely granulose, olive-green to greenish black body, the 

 lobes broad, round, often imbricated, with entire, ascending margins; greenish 

 below; apothecia small to middle-sized, 0.5-1.5 mm. across, sessile, scattered, the 

 disk concave to slightly convex, brown or reddish brown, the algoid exciple thin, 

 entire, often granulose; hypothecium cloudy to brownish; spores ellipsoid-pointed 

 or acicular, 3-5- or rarely 7-septate, 28-40 X 5-9 [x. 



On trees and rarely on rocks, throughout the United States. 



3. Synechoblastus laciniatus (Nyl.) Fink n. comb. 



Collema laciniatum Nyl., Syn. Meth. Lich. 1:116. 1858. Collema Nylanderianum 

 Zahlbr. 



Transforming the algal colony into a small to middle-sized, tough, round, olive- 

 green, stellately lobed body, the lobes long, narrow, ascending, irregularly divided, 

 with rough, nodular tips; apothecia middle-sized, 0.8-1.5 mm. across, subsessile, 

 the disk flat to slightly convex, reddish brown, the algoid exciple thin, becoming 

 subcrenate; hypothecium cloudy; spores fusiform-ellipsoid, 1-septate, 15-18 X 

 5-6 [x. 



On calcareous rocks, Tennessee, Alabama, Kansas, Nebraska, Colorado, and 

 California. 



4. Synechoblastus ohioensis Fink, Ohio Biol. Surv. Bull. 5:46. 1915. 



Collema ohioense (Fink) Zahlbr. 



Transforming the algal colony into a small, irregularly lobed, olive-green to 

 greenish black body, the lobes ascending with closely wrinkled margins; greenish 

 brown below; apothecia small to middle-sized, 0.5-2.5 mm. across, sessile, scat- 

 tered, the disk flat to convex, reddish brown to brown, the algoid exciple thin, 

 entire or rarely disappearing; hypothecium cloudy; spores ovoid to ellipsoid- 

 pointed, 1-septate, 12-24 X 5-8 /x. 



On limestone, Ohio. 



5. Synechoblastus coccophorus (Tuck.) Fink, Mycologia 1:87. 1909. 



Collema coccophorum Tuck., Proc. Am. Acad. 5:385. 1862. 



Transforming the algal colony into a small, irregular, blackish green body, 

 composed of minute, erect, round lobules or stalked granules, often run together 

 into crenate, granulose lobes toward the circumference; apothecia middle-sized, 

 0.8-2 mm. across, sessile, more or less crowded, the disk flat, reddish brown, the 

 algoid exciple thin, becoming granulose; hypothecium hyaline to cloudy; spores 

 ovoid-ellipsoid, 1-septate, 11-20 X 5-8.5 fx. 



On soil, Texas, Arizona, and California. 



6. Synechoblastus texanus (Tuck.) Mull. Arg., Rev. Mycol. 10:54. 1888. 



Collema texanum Tuck., Am. Journ. Sci. II. 28:200. 1859. 



Transforming the algal colony into a small, lobed, deep green and blackening 

 body, the lobes rather narrow, prostrate or ascending, palmately much-divided and 

 finally covered with wartlike lobules; apothecia small to middle-sized, 0.5-2 mm. 

 across, adnate, the disk concave to flat or slightly convex, reddish brown, the 

 algoid exciple thin, becoming crenate; hypothecium hyaline; spores ovoid, 1- 

 septate, 10-18 X 5-8 /x. 



On old wood and soil, Virginia, Alabama, and Texas. 



