LEPTO MIT ALES 893 



Araiospora coronata Under 



Mycologia, 18: 176, pi. 21, figs. 1-14. 1926 



(Fig. 70 H, p. 890) 



"Basal cell subcylindrical, 826-846 . 45-48 jji, with well developed 

 branched rhizoidal system at the base, and giving rise to few or many 

 sporangiophores at the rounded apex. Sporangiophores with constric- 

 tions and repeatedly and umbellately branched, the segments successive- 

 ly more elongate and slender. Zoosporangia elongate-elliptical to 

 subcylindrical, occurring singly or in whorls of two to six, terminating 

 the branches or at the distal ends of the segments which make up the 

 branches. Sporangia of two types: simple sporangia smooth, 63-85 : 

 11.5-16.2 [x; spinose sporangia with 4 6 short (7-9 \x), straight or 

 slightly curved finger-like spines in a circle around the apical papilla of 

 discharge, 68-130 x 12-26 [x. The entire plant 5 mm. in length. Oospores 

 not observed" (Linder, he. cit.). 



On submerged fruit and twigs (F., L. 258), South America (British 

 Guiana). 



Although no sexual organs were found in this species, the crown of 

 from four to six short straight or slightly curved spines on the spiny 

 sporangia distinguishes it from Araiospora pulehra, A. streptandra, and 

 A. spinosa. 



RHIPIDIUM Cornu 



Bull. Soc. Bot. France, 18: 58. 1871. Non Rhipidium Bernhardi, in Schrader, 

 Journ. fur die Botanik, 2: 127. 1800 (1801); non Rhipidium Wallroth, 

 Flora cryptogamica Germaniae, 2: 742. 1833 



(Fig. 71, p. 894) 



Thallus differentiated into a well-defined more or less epibiotic basal 

 cell and hyphal branches, basal cell consisting of a proximal cylindrical 

 main axis surmounted by an expanded peltate, lobed, contorted, or 

 branched thick-walled distal platform (the axis or the platform some- 

 times lacking); reproductive organs pedicellate on constricted septa, 

 arising singly or in umbellate clusters from branches of the axis, or, 

 more commonly, directly from the edges of the platform, or terminally 

 on long upright cylindrical branches which are constricted and pseudo- 



