licea] liceaceab 187 



Sporangia stalked, furnished with a lid of thinner substance. 



(30) Orcadella. 



Fig. 38. — Orcadella operculata Wingate. 



a. Group of sporangia. Magnified 8 times. 



b. Sporangium with open lid. Magnified 80 times. 



Fig. 38. 



Genus 29.— LICEA Schrader Nov. Gen. PL, 16 (1797). 

 Sporangia sessile, subglobose, hemispherical, or forming plas- 

 modiocarps ; sporangium-wall cartilaginous (membranous in 

 L.biforis) ; spores olive-brown, lilac-brown or nearly colourless . 



KEY TO SPECIES OF LICEA. 



A. Sporangium- wall cartilaginous : — 



Sporangia hemispherical, dehiscing in lobes ; spores brown, 

 9 to 11 /x. 1. L. minima 



Sporangia subglobose or bolster-shaped, dehiscing hi lobes ; 

 spores almost colourless, 8 to 10 /a. 2. L. castanea 



Sporangia pulvinate, dehiscing in lobes ; spores 16 to 20 fx. 



3. L. pusilla 



Plasmodiocarps elongate, 2 to 4 mm. long, dehiscing 

 irregularly. 4. L. flexuosa 



B. Sporangium-wall membranous ; plasmodiocarps about 



0-2 mm. long, ; 1 mm. wide, dehiscing by a longitudinal 

 fissure. 5. L. biforis 



1. L. minima Fr. Syst. Myc, hi. 199 (1829). Plasmodium 

 yellow (teste Rex). Sporangia scattered, hemispherical on 

 a broad base, depressed, 0*2 to 05 mm. diam., brown or nearly 

 black, dehiscing hi three or four lobes ; sporangium- wall 

 cartilaginous, dark brown, opaque with granular deposits, 

 except the margins of the lobes which are dotted on the 

 inner side with plasmoclic granules 1 to 2 /x diam. Spores 

 olivaceous-brown or lilac-brown, spinulose, 9 to 12 /x diam., 

 the wall thinner on one side. — Macbr. N. Am. Slime-Moulds, 

 148 ; Torrend Fl. Myx., 66. Tubulina minima Mass. Mon., 36. 

 Kleistobolus pusillus Lippert in Verh. Zool.-Bot. Gesell. Wien. 

 xliv. 70, t. hi (1894). 



PI. 148. — d. sporangia (United States) ; e. spores and fragment of sporangium- 

 wall showing the plasmodic granules on the margin of a lobe ; /. spore. 



This minute species is closely allied to L. pusilla from which it 

 differs in the entire lobes of the sporangium and the smaller rougher 

 spores. Glycerine preparations of the type of Kleistobolus pusillus 



