454 Bulletin 315 



the broad flat base somewhat cylindrical, always higher than broad, 30-45/1, 

 occasionally 50^ high and 20-40^ broad, usually 25-30/i. Spores broad, 

 oval, or also a few almost globose (4-5-) 6-9 (-12) by (4-)5-7(-9)m- Zygo- 

 spores unknown. Does not invert cane sugar. 



Hab. Isolated several times from garden and flowerpot soil in the 

 Botanical Gardens of Christiania, still very rare, Hagem. 



Mucor dispersus Hagem, Neue Untersuch. u. Norw. Mucorineen. Ann. 

 Myc. 8: 272-275. figs. 4-6. 1910. 



Sporangiophores forming none or slightly dense tufts (rasen) of different 

 heights; the greater, 2-3 cm. high, very scattered, ascending, extremely thin 

 (4-) 5-7 (-9) At thick, waving to and fro, mostly soon dropping down, 

 clustered, monopodially branched, with short, reflexed, frequently one- 

 time-branched branches, chief branches as well as twigs ending in spo- 

 rangia; the smaller, 1-2 mm. high, mostly reflexed, with small sporangia. 

 End sporangia of the taller sporangiophores small, 50/x, with easily dis- 

 solving wall and smaller, usually blunt and broad spherical, seldom oval, 

 columella (i4-i5-)i7-i9(-2i)ai high and (i4-i5-)i8-2i(-27)/x broad. 

 Basal collar present. 



Sporangia of the side branches, as well as those of short sporangiophores, 

 of very different size, 15-45JU, spiny, with nondiffiuent membrane, with 

 transparent spore mass that is frequently very small, 15^1, and containing 

 only 2-4 spores, but also greater spore mass 3 0-4 5/: with numerous spores, 

 mostly falling closed and remaining intact for a long time. 



Spores of variable dimensions (9-io-)ii-i3(-i5-i8)/i, usually round or 

 slightly long, sometimes roundish angled. Substratum mycelium, with 

 peculiar long, frequently ioo-200)u thick, swellings filled with oil drops, 



Heterothallic ; zygospores unknown. Hybridizes with M. lamprosporus 

 Lendner. Inverts saccharose. 



The swellings are very characteristic. The oil drops form near a septum, 

 back of this is then laid down another septum. 



Hab. Isolated only once in Norway from the deep soil. Closely 

 related to M. lamprosporus Lendner. 



Mucor sylvaticus Hagem, Untersuch. u. Norw. Mucorineen i : 1-34. 

 figs. 11-12. 1908; reprint from Vid.-Selsk. Skr. I, Math.-Naturv. Klasse 

 No. 7, 1907. Lendner, Les Mucorinees de la Suisse, 74-75. fig. 26. 1908. 



Colonies gray- white; sporangiophores erect, forming a dense growth 

 over the entire substratum, i-i5cm. high, always sympodially branched, 

 with alternating right and left sporangial stalks that are separated from 

 the further growing branches by a septum at the base; sporangial stalks 

 straight, only seldom slightly curved, 200-500/i long, ascending, forming 

 an angle of 30-50° with the chief axis of the sympodium; sporangia never 

 sessile, yellow-green to weak black-green, globose, 45-70/1 in diameter 



