378 HERRE 



Station ; altitude about looo feet. Probably occurring in similar 



situations throughout the mountains. 



Lichen liniosiis Ach. Lich. Suec. Prodr. 126. 1798 (excl. syn. 



Collcma graniforuiis Hoffman). 

 Collema Itmosum A^zh.. Lich. Univ. 629. 1810. 



According to Crombie, Brit. Lich. i : 47. 1894, Collema 

 limosum is a synonym of Collcma glaiicescens Hoffman, Deut- 

 sches Flora 2 : 100. 1795. If this is correct the name proposed 

 by Acharius must be discarded. 



6. COLLEMA PLICATILE Ach. 



Thalius, small, orbicular, thick, laciniate ; divisions distinct, 

 separate, or disappearing centrally leaving only the marginal 

 lobes ; these rugose, undulate-plicate, compact, more or less 

 ascendant; surface sometimes covered with small erect gran- 

 ules or lobules : color dingy brownish green or black. Apo- 

 thecia small to medium, numerous, concave or usually plane ; 

 disk reddish or more often blackening, the margin entire or 

 fiexuous ; spores ovoid ellipsoid, quadrilocular, 8 x 30, 7^ X 

 321^, and 7>^ X 35 mic. 



On limestone rocks near the summit of Black Mountain, alti- 

 tude 2700 feet, and at New Almaden, at about 1200 feet. Rare. 



Conspicuously different in habit from an}- other Collema in 

 our flora. 

 Lichen ^licatilis Ach. Nov. Att. Acad. Sci. Stockh. 16: 11, 



pi. I,/. 2. 1795. 

 Collema plicatile Kc\\. Lich. Univ. 635. 18 10. 



7. COLLEMA CHRISTATELLUM Tuckerman. 



Thalius scattered, microscopic, forming an indeterminate 

 crustaceous or squamulose crust; lobes minute, ascendant, with 

 more or less dissected and crenate or dentate edges, or reduced 

 to tiny erect lobules ; color greenish or brownish black. Apo- 

 thecia medium size, concave ; disk concolorous or reddit^h ; mar- 

 gin entire. 



On clay and crumbling rock on a steep slope in Hidden Villa 

 Canon, elevation 800 feet. Probably occurring throughout in 

 similar situations but too readily overlooked. 



