174 ] The Classification of Lower Organisms 



3. Aethalia consisting of more or less 

 separate sporangia. 



4. Sporangia tubular, opening 



through terminal pores Family 3, Tubiferida. 



4. Sporangia indistinct, their walls 

 becoming freely punctured and 

 converted into a reticulate 



pseudocapillitium Family 4. Retigulariacea. 



3. Aethalia not consisting of distin- 

 guishable sporangia Family 5. Lycogalacttoa. 



1. Capillitium present. 



2. Fruits without considerable deposits of 

 calcium carbonate. 



3. Spores black or dark, capillitial 

 hairs smooth (order Stemonitales 

 Macbride). 



4. Fruits aethalioid, capilHtium 

 poorly defined, without a cen- 

 tral axis Family 6. Amaurochaetacea. 



4. Fruits of separate sporangia 

 with a definite capillitium in- 

 cluding a central axis (colu- 

 mella). 



5. Capillitium spreading hor- 

 izontally from the colu- 

 mella Family 7. Stemonitea. 



5. Capillitium spreading 

 chiefly from the summit of 



the columella Family 8. Enerthenemea. 



3. Spores pallid or yellow (order Tri- 

 chiales Macbride). 



4. Capillitial hairs smooth, un- 

 branched or sparsely branched. 

 5. Capillitial threads hori- 

 zontal, attached at both 



ends Family 9. Margaritida. 



5. Capillitial threads run- 

 ning at random, not at- 

 tached at the ends Family 10. Perichaenacea. 



4. Capillitium reticulate, sculp- 

 tured, but not with spiral bands. . .Family 11. Arcyriagea. 

 4. Capillitial threads unbranched 

 or sparsely branched, sculp- 

 tured with spiral bands Family 12. Trighiagea. 



2. Fruits containing considerable deposits 

 of calcium carbonate (order Physarales 

 Macbride). 



3. Calcium carbonate both in walls 



and in capillitium Family 13. Physarea. 



