Fungous Flora of the Soil 459 



Colonies gray or weak blue-gray. Sporangiophores erect, up to 2 

 cm. high, sympodially branched with few long branches, ending in a 

 sporangium. Side branches long (2-3 times as long as with M. sylvaticus), 

 usually 600-1, 500JU long by io-15/i thick, frequently more or less refiexed 

 and ending in sporangia. Sporangia spherical, 50-60 (-70)^1 in diameter, 

 with quickly dissolving membrane. Columella ovate or suboval, almost 

 always 3-6 /z higher than broad, 2 7-3 3 ^ broad and 30-36/x high, with or 

 without colorless contents and usually with an inconspicuous basal collar. 

 Spores oval or ellipsoidal (larger th.Sin With. M . sylvaticus) , 5-7 (-8) by 3.5-5 

 (-6)/i- Zygospores unknown. 



Hab. Especially numerous in old decaying bark of conifers, and in 

 old wood as well, seldom in the soil, Norway, Hagem. 



Mucor Jansseni Lendner, Bui. Herb. Boissier ser. 2,7: — . 1907. Les 

 Mucorinees de la Suisse, 88-89. fig- JO- 1908. 



Sporangiophores 2-6 mm. high, branched in corymbs or sympodia 

 with each branch ending in a sporangium, with membrane having oblique 

 strias; sporangia dark bluish black, 50-70/i in diameter, with finely granu- 

 lated, nondissolving, but fracturing, membrane; columella sometimes 

 spherical with widened flat sessile base, sometimes more elongated and 

 conical, dark black or grayish, maximum 30JU broad by 34/x long, the smaller 

 proportionately longer, measuring 20^ broad by 26/x long; spores globose, 

 generally 5 to 6ju in diameter, the smallest 3-4^1 in diameter. 



Hab. Soil of the Janssen Cabin, summit of Mt. Blanc, 4,810 m., 

 summer 1906, Lendner. 



Mucor plumbeus Bonorden, Abh. Naturf. Gesell. Halle 8: 109. 1864. 



Syn Mucor spinosus van Tieghem, Ann. Sci. Nat. ser. 6, 4: 390. 1876. 

 Mucor aspergilloides Zopf, Verh. Bot. Ver. Brandenb 23: 22. 1881. 



Sporangiophores rigid, erect, thick, up to i cm. high, mixed mono- 



podially and cymose-sympodially branched with all 



branches ending in sporangia, straight, seldom bending or 



refiexed, with a septum at the base, with hyaline smooth 



membrane, hyaline contents; sporangia globose, small, 



up to looyu in diameter, at first hyaline, at maturity dark 



brown or black, finely spiny, membrane dissolving, basal 



collar; columella sessile, long cylindrical or pyriform, with „ 108 —M 



one or more irregular, straight or bent spines on the cor plumbeus 



summit, 22-85 by 8-6 5 u, membrane weak smoke-gray or Bonord. A, 

 '^ -^ "^ _ . sporangium, x 

 brownish, contents hyaline; spines up to 5^1 in length; 236.6; B, col- 

 spores globose, yellow-brownish, exospore with irregular umella, show- 

 folds. Chlamydospores are not infrequent as with M. spines, x 



racemosus, also on the sporangiophore up to the 236.6; C 



1 & 1 1 spores, X 236.6 



columella. 



