152 



ENDOSPOREyE. 



[ORCADE LLA 



SPECIES EXCLUDED FROM THE GENUS. 



L. ccespitosa Peck. = Lindbladia Tubulina Fr. 



L. Lindheimeri Berk. = Fuligo septica Gmel. 



L. perreptans Berk. = Brefeldia maxima Host. 



L. rubiformis Berk. = Tubulina frayiformis Pers. 



L. spermoides Berk. & Curt. = Lindbladia Tubulina Fr. 



Genus 26. OKCADELLA Wingate, in Proc. Acad. K Sc. Phil. 

 (1889), p. 280. Sporangia stipitate ; sporangium-wall opaque, 

 granular, except in the upper part, where it forms a mem- 

 branous lid. 



123. Orcadella operculata Wing., Lc. (1889). Plasmodium? 

 Total height O4 to 0'7 mm. Sporangia urn-shaped or subglobose, 

 stipitate, erect, scattered, O'l to O2 mm. diam., nearly black, lid 

 flattened, circular, dull yellow, shining ; sporangium-wall cartila- 

 ginous, opaque from deposits of refuse matter ; lid membranous, 

 beset with minute granules 0'5 to 1 /x, diam. Stalk cylindrical, 

 subulate, nearly black, filled with dark coarse refuse matter. 

 Spores yellowish in mass, almost colourless and smooth, 8 to 11 

 ^ diam. Mass., Mon., p. 49, 



Plate LVIL, B. d. sporangia, x 20 ; e. fragment of sporangium- wall and 

 papillose lid, with spores, x 280 ; /. spore, x 600 (United States). 



Hab. On dead wood. Philadelphia (L:B.M.123). 



Order III. TUBULINACE^E. Sporangia tubular, compacted, 

 stalked or sessile ; sporangium- wall membranous, pale rufous, 

 without granular deposits : spores minutely reticulated, 4 to 7 /x 

 diam. 



KEY TO THE GENERA OF TUBULINACEJE. 



Sporangia without tubular extensions. (27) TUBULINA. 



Fig. 35. Tubulina frag if ormis Pers. 

 Cluster of sporangia. Magnified 2 times. 



Fig. 35. 



Sporangium-wall with tubular extensions connecting it with a 

 hollow pseudo-columella. (28) SIPHOPTYCHIUM. 



Fig. ^.SipJioptychw/m Casparyi Rost. 

 a. Cluster of sporangia. Magnified 3 times. 



1). Upper part of two sporangia, their walls 

 partially removed, showing the columella. 

 Magnified 10 times. 



Fig. 36. 



