188 MINNESOTA BOTANICAL STUDIES. 



350 mic. diam., gregibus ^-Imm. diam. ; basidiis filiformibus conges- 

 tis, septatis, ad basim ramosis, minute torulosis, catenis plerumque 

 singulis, ad septa, et unilateralibus saepius binis ad apices, 35-50 

 X3 mic. ; conidiis oblongis hyalinis, 2-20 in catenis saepe dichotome 

 ramosis, 3X1 mic. Xomen propter plantam altricem.' In ramulis 

 vetustis Populi tremulmdis Popnlus treiiuiIoidcs-hyWo, Long's Peak 

 Inn 2700 m., Augusti, 1907. (Crypt. Form. ,Colo. 478.) 



Sirocyphis. 



Pycnidia superficiatia, discreta, primitus globoidea deinde late 

 aperta vel cupulata, laeticoloria vel alba, mollia, membraneo-ceracea 

 vel carnosa, pilis rigidis dense obsita. Basidia simplicia filiformia. 

 Conidia oblonga vel bacillaria continna hyalina longe-catenata in 

 catenis simplicibus. Xomen propter pycnidium cupulatum conidiis 

 catenatis. Est CJiaetozythia vel Cyphina conidiis catenatis sen 

 Sirocythia pilosa. Typus 5". nivea! 



Sirocyphis nivea. 



PLATE XXV. FIG. 5. 



Pycnidiis superficialibus subgregariis. globosis vel suboblongis. 

 oreolato apertis vel subcupulatis, siccitate clausis, albis, mollibus, 

 ceraceis, excipulo subparenchymatico. extus pilis byalinis rigidis 

 simplicibus fere solidis eseptatis plerumque rectis attenuato-acutis 

 100-150X6 mic. dense obsitis, 250-400 mic. lat. ; basidiis simplicibus 

 filiformibus 20X1 mic; conidiis oblongis vel bacillaribus. continuis 

 hyalinis utrinque truncatis vel obtusis, eguttulatis. rectis in catenis 

 simplicibus brevibus digestis 5-6X1 mic. Xomen propter colerem ni- 

 veum. 



Ad caulos vetustos Pedknlans racem sae Picca-hyWo. Long's 

 Peak 30CO m.. Augusti, 1907. (Crypt. Form. Colo. 497.) 



EXPLANATION OF PLATE. 

 PLATE XXV. 

 \. Comoclathris lanata: a, perithecia X30; b, ascus and paraphyses 

 X400: c. hair X400; d, spore, side view X400. 



2. Pezoloma griseum: a, cup X25; b. ascus and paraphyses X400; 

 c, tooth X400. 



3. Leucopezis excipulata: a. cup X4: b, ascus and paraphyses X400; 

 c. hair X400. 



4. Sirodothis populi: a. pycnidia X30; b, basidia and conidia X400. 



5. Sirocyphis nivea: a. pycnidia X30; b, basidia and conidia X400; 

 c. hair X400. 



