MYXOMYCETES. 57 



- 



Family 14. CRIBRARIACE.T:. 



Sporangia stipitate, standing singly; usually only the upper 

 portion of the wall cracking away, leaving behind the net-like 

 inner thickenings. Rtfki. Mon., 229. 



Genus 30. DICTYDIUM. Sclirad. 



Thickenings of the inner wall of the sporangia of uniform width 

 compounded by very thin thready fibres into a net with more or 

 less rectangular meshes. Rtfki. Mon., 229. 



68. Bictydium cernuum. (Pers.) 



Hypothallus, stem, and mass of spores purple-brown ; stem two 

 or three times longer than the sporangium, erect, bent at the apex; 

 sporangium globose, i- mm. diam , nodding; net like thickenings 



after the dispersal of the spores deficient at the apex ; spores . 



Rtfki. Hon., 229. 



On rotten wood, pine stumps, &c. (Figs. 17-19, 22.) 



Mucor cancellatus, Batsch., f. 232 (1789). 



Stemonitis cancellata, Gmel. Sys., 1468 (1791). 



Splicerocarpus trichioides, Bull., p. 124 (1791). 



Ct'ibraiia cermta, Pers. Obs., i., 91 (1796). 



Dictijdium umbilicatum, Schrad., t. 4, f. 1 (1797) ; Fr. S. M., iii., 

 165 ; Berk. Eng. Fl., v. 318; Cooke Hdbk., 1165, fig. 134. 



Dictydium ambigiium, Schrad., t. 4, f. 2 (1797). 



Trichia cernua, Poir. Ency., viii., No. 25 (1808). 



Dictydium cernuum, Nees, f. 117 (1816); Rtfki. Mon., p. 230 

 (1875). 



Dictydium triclnoides, Chev. FL Par., 327 (1827) ; Corda. Ic. v., 

 f. 36. 



Genus 31. HETERODICTYQN. R. 



Thickenings of the inner wall of sporangium compounded below 

 of parallel continuous wide ribs combined by thin threads into a 

 net with rectangular meshes, passing in the upper half of the 

 sporangium into polygonal knots, with irregular radiating thin 

 branches. Rtfki. Mon., 231. (Fig. 16 ) 



Genus 32. C RIB R ARIA. Pers. 



Thickenings of the inner side wall of sporangia compounded 

 into a net-work of combined threads, often flattened and developed 

 into knots at the points of junction ; meshes of the net irregularly 

 polygonal ; lower part of the sporangium often basket-shaped. 

 Rtfki. Mon., 231. 



