292 PovaAH: A CRITICAL STUDY OF 
3. Mucor LAMpROSPORUS Lendner, Bull. Herb. Boissier II. 8: 78. 
1908; Les Mucorinées de la Suisse, 92. Berne, 1908 
Forming on bread an erect, dense, pale smoke gray (Ridgway) 
turf, 1.5-3 cm. tall; sporangiophores 10-23 u in diameter, ramifying 
with a few long branches, or with very short, circinate branches, 
ending in a sporangium; sporangia globose, terminal 62-82 yu in 
diameter, lateral 33-434; sporangium wall of large sporangia 
rapidly deliquescent (glycerine mount necessary to obtain sporan- 
gial measurements), of small sporangia persistent or dissolving, 
leaving a slight basal membrane; columella globose to oval, free, 
16-51 X 18-43 yu; spores globose, shining, large, 8-13 u in diam- 
eter; zygospores not found (presumably heterothallic). 
A single collection of this species, easily recognized by the large 
shining spores, was obtained from an oak root, found by Mr. H. 
Andrews, brought into the Cryptogamic Laboratory and placed 
in a moist chamber for study of mycorhiza. No. 35. It is 
interesting to note, in this connection, that the closely-related 
species Mucor sphaerosporus Hagem was obtained from mycorhiza 
of Pinus montana by Professor Gran in Norway. 
On rice this species grows 25 mm. high and on grapefruit 17 
mm. It ferments dextrose, but does not oxidize tyrosin. 
4. Mucor abundans sp. nov. 
Forming on bread a dense, erect, smoke gray turf (Ridgway), 
tinged drab, 1.5-3.5 cm. tall; sporangiophores 8-23 » in diameter, 
at first simple, later with one to three lateral branches which are 
in turn branched once or twice (exceptionally five times), with 
branches always terminating in a sporangium, and with a septum 
above point of insertion of branch; sporangia globose or subglobose, 
smooth or incrusted with very delicate crystals, 56-78 uw in di- 
ameter (extremes 39-98 y), at first yellowish, becoming dark gray 
with a greenish tinge at maturity; sporangium wall deliquescent, 
leaving a basal membrane; columella subglobose to pyriform, free 
or slightly adnate, 31-40 X 25-35 u (extremes 21-66 X 20-55 »), 
hyaline or tinged gray; spores variable, globose to short elliptical, 
3-5 w in diameter or 4-5.5 X 3-4.5 wu (a few 8 X 6 nu); chlamydo- 
spores and yellowish globules in submerged mycelium; zygospores 
not found (presumably heterothallic). [PLATE 17, FIGs. 1-6.| 
This species was found to be very common, no less than eleven 
collections having been made from the following sources: three 
times from horse dung, twice from sandy tilled soil, three times 
