70 



Fruit body simple, immersed in the frond. Spores numerous. 

 Frond consisting of long threads, covered without by a continu- 

 ous stratum of vertical threads or cells. CRYPTONEMIACE/K. 



Fruit body evidently compound, or consisting of many smaller 

 groups arranged in no special order. Smaller groups consisting 

 of few spores. 



Fruit body either immersed in the frond, or contained in an exter- 

 nal pericarp. Tetraspores in sori within the frond, or in exter- 

 nal warts made up of threads. Divided crosswise or in zones. 

 Frond fleshy or gelatinous, made up of thread-like or shorter, 

 rounded cells. GTIGARTINE;K. 



Fruit body in a pod-like receptacle. Spores numerous, rather 

 large. Tetraspores produced in similar receptacles, pear-form, 

 divided in zones. Frond fleshy, made up of interior long threads, 

 and exterior shorter cells. Containing only one genus. 



FURCELLARIE.. 



157. Fruit body immersed in the frond. 160 



Fruit body contained in an external pericarp. 158 

 Fruit body naked, lying in spongy or wart-like excrescences of the 

 frond. 



Fruit bodies numerous in each excrescence of the frond, surrounded 

 by loose threads. Spore threads obconical, very short, radiating 

 from a cellular, central placenta, having single spores in the ter- 

 minal joints. Frond with a rounded stem made up of long 

 threads, surrounded by larger, short, granular cells, and having 

 an external covering of small cells united into vertical, bead-like 

 threads. SPONGIOCARPEJE. 



Fruit bodies consisting of transformed, bead-like threads of the 

 warts. Spores produced in each joint of the threads, rounded or 

 discoid, one in each joint. Tetraspores produced by the trans- 

 formation of joints of similar threads, divided crosswise or in 

 zones. Frond globose, or expanded horizontally. Cells held 

 together by mucus more or less consistent. SQUAMARIACE^;. 



158. Placenta parietal, that is the spore-bearing threads arising 

 from the walls of the pericarp, and converging towards the cen- 

 tre. Spore-bearing threads jointed, branching, bearing simple 



