Fink : New Genus and Species of the Collemaceae 237 



spermagonia, but occurring internally in groups of several indi- 

 viduals (pi. 13, f. 2, 3, and 4). 



Collemodes Bachmanianum sp. nov. 



Transforming the algal-host colony into a middle-sized, orbic- 

 ular or irregular body, which, is 1.4 to 7 cm. across and 375 to 

 850 mic. thick, and closely attached to the substratum, with entire 

 or repand crenate, often imbricate lobes, which are olive varying 

 toward blue or black and scarcely lighter below, the marginal ones 

 often with strongly ascending or even erect borders, while the 

 central ones are usually flat, and with the algal-host colonies more 

 numerous toward the surfaces ; thallus of variously disposed 

 hyphae, more densely placed under and about the apothecia where 

 they are straight or wavy and usually stand roughly perpendicular 

 to the disk; rhizoids many and for most part disposed in groups 

 at the various points of attachment to the substratum; ascogonia 

 occurring singly or in groups of 2 to 4 from 100 to 160 mic. below 

 the upper surface of the thallus, each ascogonium of 2 to 4 coils, 

 which contain 6 to 12 cells (pi. 13, f. 1 and 4) ; the trichogynes 

 passing in various directions (pi. 13, f. 1 and 4) usually toward 

 groups of internal spermatia; spermatia commonly found in 

 groups of 3 to 15, and 100 to 300 mic. below the upper surface 

 of the thallus, the groups arranged on the sides or the ends of 

 small arid often irregular hyphae, the spermatium oblong-clavate, 

 6 to 14 mic. long and 2 to 3 mic. wide ; apothecia many, adnate or 

 sessile, scattered or thickly disposed over the central portion of 

 the thallus, 0.5 to 4.5 mm. across; disk red-brown, concave or 

 rarely becoming flat or slightly convex, surrounded by an entire 

 or a rugose-crenate thalliod margin, which extends slightly above 

 the disk ; exciple thin, composed of interwoven hyphae, hyaline 

 or light-brown ; hypothecium hyaline to light-brown, composed of 

 interwoven hyphae, 45 to 80 mic. thick ; hymenium hyaline below 

 to brown above, 135 to 165 mic. thick; asci cylindrico-clavate, 100 

 to 120 mic. long and 20 to 30 mic. wide; spores hyaline, ellipsoid, 

 muriform, longitudinally 4 to 5-celled and transversely 1 to 2- 

 celled, 8 in each ascus. 



Examined from Iowa (Fink), Minnesota (Fink), Wisconsin 



