Jan., 1905.] Key — Hickories in Winter Condition. 



269 



DESMIDIACE,^. 



Desniidium aptogonium (Kuetz) 



Lagerh. 

 Hvalotheca dissiliens (Smith) 



Breb. 

 Closterium acerosuni Ehrenb. 



" ensis Delph. n. 



lunula (Muell) Nitzsche. 

 parvulum N^eg. 



" Tnoniliferum (Bory) 



Ehrenb. 

 Closterium liebleinii Kuetz 



Pleurotcenium trabecula (Ehrenb) 



Neeg. 

 Cosmarium nitidulum DeNot. 

 " margaretiferum (Turp) 



Menegh. 

 " botrytis(Bory) Menegh. 

 " brebissonii Menegh. 

 " birettim Breb. 

 Staurastrum incisum WoUe. n. 



" leptocladium Nordst. n. 



" fusiforme WoUe. n. 



KEY TO THE OHIO HICKORIES IN THE WINTER CONDITION 



Louis H. Scholl. 



Hicoria Raf. Large trees with hard, heavy and very tough 

 wood; twigs very tough, with alternate leaf scars, not 2-ranked, 

 without stipular and self-pruning scars; bundle scars scattered, 

 sometimes in three areas; terminal bud present, large; bud scales 

 usually numerous and imbricate or valvate and few, but at least 

 3 exposed, pubescent, sometimes peltate pubescent; axillary buds 

 superposed or apparently single, not clustered at the tip of the 

 twig; pith solid and 5-angled ; fruit a nut with a husk. 



1. Bud scales valvate, 3-5 exposed, yellow, peltate pubescent; pith- 

 brown; bark of trunk close and rough; husk of fruit thin, tardily 

 and irregularly 4-valved, splitting to below the middle; nut 

 smooth, thin shelled, short pointed; seed intensely bitter. 



H. minima (Marsh.) Britt. Bitternut (Hickory). 



1. Bud scales imbricate, more than G, vmless shed. 2. 



2. Terminal bud large, 3^-1 inch long; husk of fruit splitting freely to t*he 



base; nut angled; seed sweet. 3. 



2. Terminal bud small, M-/^ inch long; husk thin, not splitting freely to 



the base ; nut slightly or not angled. 5. 



3. Lower bud scales deciduous ; bark close, rough ; twigs stellate pubescent; 



husk not separating quite to the base. 



H. alba (L ) Britt. Mockernut (Hickory). 



3. Lower bud scales persistent during the winter; bark shaggy, separating" 



in long plates; husk very thick, splitting to the base. 4. 



4. Terminal bud of the globose type, densely pubescent; fruit oblong; 



thick shelled, pointed at both ends. 



H. laciniosa (Mx.) Sarg. Shellbark (Hickory). 



4. Terminal bud of the ovate type, puberulent ; fruit subglobose ; nut thin 



shelled, rounded at the base. 



H. ovata (Mill.) Britt. Shagbark (HickorjO- 



5. Bark close; fruit obovoid; nut thick shelled, angled; seed astringent 



and bitter, not edible. H. glabra (Mill.) Britt. Pignut (Hickory). 



5. Bark of old trees separating in strips; fruit nearly globular; nut thin 

 shelled, only slightly or not angled; seed sweet. 



H. microcarpa (Nutt.) Britt. Sniall Pignut (Hickory)^ 



