CHIVERS. — NEW SPECIES OF CHAETOMIUM 85 



Chaetomium quadrangulatum, sp. nov. 



Griseum. Peritheciis majoribus, longioribus, 403 X 294 n (^333- 

 456 X 243-350), cirrhis longissimis instructis; pilis lateralihus 

 numerosis, teniiibus, rectis, regulariter et distincte septatis, basi 

 olivaceo-fuscis, asperulis vestitis, apice hyalinis, levibus; pilis termi- 

 nalibus biforniibus, aliis spiraliter convolutis, irregulariter pauci- 

 septatis, asperulis vestitis, basi olivaceo-brunneis vel atris, apice 

 dilute eoloratis, aliis subrectis, undulatis vel convolutis, irregulariter 

 pauciseptatis, asperulis vestitis, ramosis, basi olivaceo-brunneis vel 

 atris, apice dilute eoloratis; ascis clavatis, octosporis, 39 X 9.7 

 p. sporif. 21 ix; sporidiis pallide olivaceis, a fronte visis subquadrangu- 

 latis, a latere ovatis, 7.3 X 6.3 n (6.4-8 X 5.6-6.4). 



Culti\ated on dung from Cambridge, IVIass. Appearing also on 

 dung from Chile and from Little Swan Island, Gulf of Mexico (R. 

 Thaxter). 



The species may be easily identified by the spores which, when seen 

 in face view, are four sided and four angled but, when seen in profile, 

 are oval. Chaetomium quadrangulatum and Chaetomium trigono- 

 sporum are the only species known to the writer which possess spores 

 with angles, the former having spores clearly quadrangular, the latter 

 clearly triangular. 



Chaetomium convolutum, sp. nov. 



Cyano-griseum. Peritheciis magnitudine mediis, globosis, 244 X 

 232 ij. (236-254 X 224-240), cirrhis instructis; pilis lateralibus paucis, 

 gracilibus, rectis, regulariter et distincte septatis, basi olivaceo-flavis, 

 asperulis vestitis, apice hyalinis, sparse asperulis vestitis; pilis termi- 

 nalibus undique asperulis vestitis, olivaceo-atris, subcontinuis vel 

 irregulariter pauciseptatis, 8-10 spiraliter convolutis, ad ipsam apicem 

 convolutionibus terminalibus regulariter successive minoribus; ascis 

 clavatis, octosporis, 56.4 X 10 yu, p. sporif. 27.4 'fx; sporidiis pallide 

 olivaceis, ovatis vel limoniiformibus, utrinque obtusis, subapiculatis, 

 8-8.4 X 6.4 M. 



Cultivated on mouse dung from Germany. 



Apparently a rare species having appeared but once. The species 

 may l)e identified by the distinct blue color of the plant when seen 

 with the naked eye or a hand lens, and by the long spreading terminal 

 hairs whose long series of coils taper abruptly to a blunt point. 



